Archive for the ‘research’ Category

Bitter Pill to Swallow for C. diff

https://articles.mercola.com/sites/articles/archive/2017/12/11/poop-pills-can-combat-clostridium-difficile.aspx?  by Dr. Mercola, December 11, 2017

Poop Pills Can Combat Deadly Infections

poop pills

Story at-a-glance–

  • An answer to a serious infection called Clostridium difficile (C. diff.) infection comes from a relatively new therapy called fecal microbiota transplantation (FMT)
  • C. diff., a common bacterium in hospitals, is a leading cause of diarrhea in health care today, with older people on medication at greatest risk, and often occurs soon after administration of antibiotics
  • FMT is when feces are transferred from a healthy donor to the gastrointestinal tract of a C. diff-infected patient to reintroduce healthy bacteria into their gut, but the pill form offers a noninvasive alternative
  • In terms of patient comfort, fewer trial subjects who were given the FMT capsule described the experience as “unpleasant” compared to receiving FMT through the colonoscopy route
  • Your gut health, as well as your overall health, are closely interconnected, so “feeding” your microbiome, as well as resisting antibiotics as much as possible, will optimize your microbiome

While it would seem that a fecal transplant in capsule form would be a somewhat bitter pill to swallow, scientists conducting a randomized clinical trial1 found this mode of transportation, in a matter of speaking, for fecal therapy was easier and just as effective for treating patients infected with the serious and dreaded Clostridium difficile infection (RCDI), or simply “C. diff.,” as receiving a fecal transplant via enema or colonoscopy, also known as fecal microbiota transplantation (FMT).

Further, FMT in pill form has the capacity to improve patients’ quality of life, as it caused fewer adverse events.2 For those who may be unaware of this protocol, fecal transplants are now not just common, but according to one study, so successful that the first trial was stopped early because the researchers deemed it unethical to withhold the treatment from patients (as some typically are given alternative therapies). As noted by NPR:

“That’s because C. diff. is kind of a special case. It’s a very invasive microbe that has repeatedly been assaulted by antibiotics which have caused a collapse in other microbes. So it’s an easy environment for microbes in a donor stool to invade.”3

C. Diff.:  Common Bacterium in Hospital Environments

One of the problems with C. difficile is that it’s one of the most common health care-associated infections and one of the foremost reasons hospital patients develop debilitating, recurrent diarrhea that’s hard to get a handle on, medically. It’s especially rampant among older individuals on antibiotics for other conditions. CIDRAP states:

“(C. diff.) can also be difficult to completely cure. As a result, recurrent infections have become a growing challenge. At least 20 percent of patients who get an initial CDI have a recurrent infection within eight weeks, with the risk of RCDI being as high as 50 percent to 60 percent after three or more infections.”4

Researchers at Brown University, where one program focuses on digestive microbes such as bacteria, fungi and viruses (human microbiomes), say C. diff. became hard to manage when antibiotics prescribed for other conditions disturbed what may have been perfectly functioning, benign gut organisms. By no means a trifling infection, Newsweek pulls no punches as it calls C. diff. both “nasty” and “deadly.”

Antibiotics may be the usual treatment in hospitals, but they only contribute to the problem by effectively wiping out beneficial bacteria in patients’ collective microbiome that might keep C. diff. in check, CIDRAP observes. In essence, FMT can be explained as feces being transferred from one healthy donor to the gastrointestinal tract of a C. diff. infected patient. The purpose is to “reintroduce healthy bacteria into the gut (as) a non-antibiotic therapy that’s shown promise in clinical studies.”5

What Happens When Your Gut Biome Becomes This Compromised?

C. diff. infection impacts half a million people in the U.S. every year. Further, it’s fatal for 15,000 of them, also every year, according to the Centers for Disease Control and Prevention (CDC).6 Still, there have been patients who found the prospect of fecal transplant therapy, even through surgical means, to be just too daunting. In fact, efforts have actually been made to extract the beneficial bacteria from the fecal matter to make the idea of swallowing it more palatable, but the effort failed.

Far from being a brand-new, innovative idea, using poop to fight the effects of C. diff. and other problems in patients has been around since at least the late 1950s. Different names, besides FMT, have included fecal biotherapy and fecal flora reconstitution. One study explains the science behind it:

“FMT involves reconstituting the normal intestinal microflora in a diseased person by infusion (via nasogastric tube, enema or colonoscopy) of a liquid suspension of stool from a healthy donor. The first report of the use of FMT (for a patient with non-CDI pseudomembranous colitis) was published in 1958. Since then, there has been mounting evidence supporting its use in recurrent CDI.”7

Your Microbiome Can Make or Break Your Health

How your microbiome works is still being scrutinized by scientists, especially in the way it can make or break your overall health. It’s clear that certain foods are considered positive for “feeding” your microbiome. Foods containing fiber are at the top of the list as they release nutrients for your gut lining. The connection between what you eat and how healthy your gut is are closely interconnected, so consider adding more fiber, especially if you aren’t getting the 50 grams of fiber per 1,000 calories you eat that I recommend.

One way fiber benefits your health is by providing beneficial bacteria in your gut with the materials needed to thrive. These beneficial bacteriaassist with digestion and absorption of your food, and play a significant role in your immune function.

One of the best ways to regain optimal balance in your gut is by eating fermented foods. Besides kimchi and other fermented vegetables, which you can make at home very easily, there are also fermented beverages such as kefir and yogurt, all providing trillions of beneficial bacteria — far more than you can get from a probiotics supplement.

Poop Pills, a Colonoscopy or the Other Alternatives?

It’s been a tough call for scientists and physicians alike, trying to determine which is worse: C. diff., antibiotics, colonoscopies (the most successful in terms of introducing fecal matter into patients) or the new poop pill-popping protocol. C. diff. being what it is comes with serious, life-altering symptoms, which Medline Plus8 says can include:

Watery diarrhea multiple times daily Stomach cramps Fever
Dehydration Nausea Abdominal pain and tenderness

A colonoscopy is an example of an invasive procedure, but there’s also the fact that patients typically undergo mild sedation, which introduces another risk because their breathing may become too slow. Further, there’s the chance that in the course of the procedure, the patient’s intestinal wall could be punctured, which could introduce life-threatening infections. Time observed:

“The benefits of swallowing a capsule are also undeniable compared to swallowing — or trying to swallow — a feeding tube through which a slurry of fecal matter is flowing through. (That’s the way that doctors testing fecal transplants originally administered their doses.) That carries the risk of aspirating some of the fecal slurry into the lungs — not to mention the unpleasantness of introducing feces to the mouth area and accidentally breathing it in.”9

The Poop-in-a-Capsule Trial

Dina Kao, a gastroenterologist at the University of Alberta in Canada, used the pills described by Time10 as “fecal matter manufactured into a capsule” for 116 patients in the trial. Compared to a colonoscopy, both methods showed a 90 percent reduction in C. diff. relapses. All 116 study subjects had suffered a minimum of three bouts of C. diff. and were randomly assigned a poop swap via either the capsule or colonoscopy.

It must have been an exercise in “mind over matter” for the patients who were required to swallow down 40 capsules in one sitting, which took an average of a half-hour to an hour. The reduction in C. diff. relapse was determined after 90 percent of the patients remained C. diff.-free after 12 weeks. Preeti Malani, professor of medicine at the University of Michigan, who wrote an editorial to go with the study, noted:

“Based on this study, I think it would be very reasonable to think about fecal transplant capsules as your preferred approach. If it were myself or a family member, I think avoiding colonoscopy would be helpful.”

Still, Melani and other researchers believe more studies are needed, not only to confirm the results found in Kao’s study, but also to get a better understanding of how fecal transplant works.

Kao herself says she plans to study all the components of fecal transplants to get a clearer picture of what exactly helps control C. diff. Besides C. diff., microbe transplanting via a capsule is also a therapy currently used for obesity, diabetes, colitis and Crohn’s disease. It’s a way gut bacteria can be positively linked to lowering the risks of such disorders and conditions as obesity, allergies, asthma and even some mental illnesses.

A Protocol Still Unapproved by Government Agencies

While fecal transplantation may at first glance come across as quackery of the highest degree, once you understand the process, it’s clear it’s a successful way to swap bad bacteria for good.

Kao, whose first reaction upon the successful trial, quipped, “It’s absolutely insane. We just don’t see (this) kind of efficacy with drugs,”11 added that she believes the favorable outcome of the fecal transplant pills will “transform” the way conventional medicine at large thinks about the unconventional therapy. She listed several of the benefits over the current protocols of antibiotics or surgery. Poop pills are:

  • Noninvasive
  • Less expensive
  • Free of the risks associated with sedation
  • Can be done in a doctor’s office

As it stands, the Food and Drug Administration (FDA) hasn’t yet given the proverbial green light to fecal transplants.It does, however, permit doctors to perform the therapy for patients not currently responding favorably to other forms of remediation, but only as long as patients understand that the poop pill is still being scrutinized as a viable treatment.

In addition, CIDRAP notes that in March 2016, the FDA proposed regulations that would further restrict use of FMT by requiring that either the patient recipient or the treating clinician personally know the donor — a restriction that, as yet, is not finalized.

Interestingly, among patients who’ve been asked what they thought of the idea of swallowing poop pills, most responded that after all was said and done, it wasn’t too bad. Newsweek observes that two-thirds of the 57 patients who got the pills described the experience as “not at all unpleasant,” while 44 percent of the 59 patients who underwent FMT via a colonoscopy were not as positive.

Perhaps when the patients remembered the alternative — that to them, poop pills were a hero of sorts due to their ability to stop the unstoppable on the other end — the therapy could only be seen in a positive light. As Kao concluded, “We still don’t understand what’s going on, and in these other conditions it’s not as clear-cut that the disturbance in the bacterial composition is the cause. Stool is such a complex mixture.”12

– Sources and References

_______________

**Comment**

Lyme/MSIDS patients use antimicrobials and have to be concerned with gut health.  In fact, antibiotic resistance and adverse events are often cited by some physicians as to why they shouldn’t be used or only in extremely limited amounts.  FMT is a clear and concise answer for this potential problem, and I pray people are taking note.  

Any treatment demands a risk/benefit assessment and until the denialists understand the severity/complexity of Lyme/MSIDS, patients will be swimming against the current and having to fight for proper/effective treatment which is much more than 21 days of doxy.  Doxy, for instance, will not touch numerous coinfections and has been found to throw the spirochete into the non-cell wall form to rear its ugly head later.  https://madisonarealymesupportgroup.com/2017/11/03/lyme-bug-stronger-than-antibiotics-in-animals-and-test-tubes-now-study-people/

https://madisonarealymesupportgroup.com/2016/02/13/lyme-disease-treatment/

https://madisonarealymesupportgroup.com/2016/01/16/babesia-treatment/

https://madisonarealymesupportgroup.com/2016/01/03/bartonella-treatment/

 

https://madisonarealymesupportgroup.com/2016/02/07/mycoplasma-treatment/

Ahern – Flawed Lyme Policies, Diagnostics, and Treatment

https://www.linkedin.com/pulse/flawed-science-behind-current-global-lyme-policies-huib-kraaijeveld/?trackingId=iZBLIQ9YmOUSF0PTHRijww%3D%3D

The flawed science behind the current global Lyme policies, diagnostics and treatment

Written by

The flawed science behind the current global Lyme policies, diagnostics and treatment

Holly Ahern is a professor of microbiology as well as the mother of a child that was severely affected by Lyme Disease. Because of this personal experience and her professional background and training, she was able to dissect the flaws in scientific reasoning that underlie decades of wrong policies, invalid diagnostics and treatment that fail too many. An interview with a mother who went deep into the (anti)scientific Rabbit Hole of the Lyme science.

 

Can you introduce yourself and share how did you got personally involved with Lyme disease? 

I am a professor of microbiology at SUNY Adirondack, which is a small State University of New York college located at the southern end of a 6.1 million acre state forest preserve known as the Adirondack Park. Prior to 2009, my program of undergraduate research focused mostly on environmental microbiology with an emphasis on small lake ecosystems, of which we have many here in the Adirondack region.

In 2009, my youngest daughter was a freshman in college and excelling both academically and athletically. In her first year, she had broken college records in her sport (swimming) and had just qualified as All-American in her first NCAA Nationals. Within a month of those achievements, she called to say she wasn’t feeling well and wanted to come home for the weekend. She went to bed that night, and didn’t get up again to fully return to her life for almost a year.

It was early spring when she got sick. There were no ticks to be seen, she did not have any kind of rash anywhere, and her physician never considered that her illness could be a tick-borne disease. She was referred to a rheumatologist (because she had profound joint and muscle pain), a cardiologist (because she had tachycardia and pain in her chest), and a neurologist (because she was having debilitating headaches, was constantly dizzy and had pain, tingling and on several occasions complete numbness and paralysis of her right arm and leg). After several rounds of blood tests, a CT scan, and a couple of MRI’s, there was still no diagnosis.

Then, in May, my husband attended a presentation at the school where he works given by one of his colleagues. The topic was Lyme disease, and after listening to the presentation and talking further with the presenter, he felt that our daughter’s condition could be related to Lyme disease.

We requested a blood test for Lyme disease, to which her physician reluctantly acquiesced. We were all surprised when it came back positive, and I remember at the time how relieved we all felt because at last, there was a diagnosis. Little did we know…

When the prescribed oral antibiotic was completed and she immediately relapsed, I realized that what I — as a microbiologist — thought I knew about this disease from textbooks and the CDC was wrong. So I started reading the scientific literature, and quickly realized that the dominant medical view of Lyme disease being a bacterial infection that was “hard to catch and easy to cure” was profoundly wrong, that the bacteria and the disease symptoms it caused were not like other bacterial illnesses, and that the CDC-recommended approach to diagnosis and treatment of this disease lagged well behind the science.

My struggles to pull my daughter out from under the weight of the chronic disease that had consumed her, made me realize that her experience mirrored that of hundreds of thousands of other people who were also being gaslighted by their physicians and marginalized by public health agencies. As my daughter’s condition improved, my attention turned first to educating the public about the dangers of ticks and the diseases they carry, followed by governmental advocacy to change the outdated and harmful health care policies of the CDC.

Along the way, I co-founded a 501-c-3 organization called Lyme Action Network, and now also serve as scientific advisor for two other organizations; Project Lyme which focuses on educating the public about ticks and tick-borne disease, and for the Focus On Lyme Foundation, which is raising funds for research toward better diagnostic tests and treatment for tick-borne diseases.

Focus On Lyme is also working to address one of the most significant roadblocks to scientific research on tick-borne diseases in humans, which is the lack of a readily accessible, no strings attached, biorepository of well-characterized human blood samples.

I (and many others) have come to realize that the path forward to accurate diagnostic tests and effective treatments will have to come from those who are most affected by the disease, through patient-centered (and often funded) projects such as this, because there is little to no leadership coming from governmental agencies on this issue.

You recently gave a testimony at the senate commission hearing of the State of New York and you gave a lecture at the Focus On Lyme 2017 conference about the science backing up Lyme and co-infections. What have you discovered?  Can you summarize your strong criticism of the mainstream assumptions surrounding Lyme in a way that everybody can understand?

Over the past 5 years, I believe it is safe to say I have read most if not all of the published science on borreliosis (the broad name for diseases caused by bacteria in the Borrelia genus).

It is very important for people to realize that when they hear medical or public health professionals proclaim that the medical guidelines dictating the practice of medicine and insurance reimbursement for Lyme disease are based on the best available science, such assertions are rhetorical hyperbole and little else.

The mainstream approach to medical practice for Lyme disease is currently guided by a relatively small number of clinical studies which are overly focused on one feature of this very protean disease – the appearance of a “bulls-eye” rash after a tick bite.

From 1977-1980, a team at Yale University headed by Alan Steere “discovered” and then defined a new disease, which he initially called Lyme arthritis. Steere noted in his early publications that approximately 25% of the people in his study cohorts had a very unique clinical feature – a rash called an erythema migrans or EM which resembles a bulls-eye – that sometimes accompanied other non-specific but debilitating symptoms (joint/muscle pain, headaches, peripheral nerve pain and sensations, fatigue).

As a newly minted “Epidemiology Fellow” of the CDC, he had been trained to look for clinical signs associated with disease symptoms, which could be “objectively” observed by a physician without relying on “subjective” reports by patients about what aches and pains they might be having. The unusual skin rash was just such a perfect, pathognomonic, feature.

Having noted and associated this unique rash with patients showing a similar cluster of subjective symptoms, his next studies set out to investigate the association of the rash with the disease. Steere’s subsequent studies were DESIGNED to CONFIRM what he wanted to be true – that the EM was a clinical sign of this new disease – as opposed to designing studies to impartially study the occurrence of the rash in people with the cluster of symptoms typical of people with Lyme disease. This is an example of a notable type of research bias, referred to as confirmation bias.

Steere also overemphasized the significance of joint swelling as a clinical sign of “Lyme arthritis,” because he was, after all, a rheumatologist, and therefore pain in a joint that was swollen could be taken as a “sign” of a disease process. Joint pain without obvious swelling was considered a nonspecific symptom that did not point to anything in particular.

The 1980s came along and New York decided that maybe they should look into this “new” disease since Long Island shares a body of water with Connecticut. SUNY Stony Brook on Long Island had a research team looking at ticks and diseases, so in 1982, the NYS Department of Health launched a study to find out just how many cases of this new disease there were in New York, to decide if the State should consider whether a public health response was needed.

The design of this study was for the Department of Health to alert New York State health care providers, through newsletter publications and also by sending letters to 300 primary care physicians, about the new disease and provide them with specific and detailed information and pictures about what to look for FIRST — a unique rash shaped like a perfect bulls-eye.

The letters directed health care providers to fill out a form for each patient seeking medical care for (in order of emphasis): a rash with a bulls-eye appearance; aseptic meningitis; facial paralysis (Bell’s Palsy); or large joint arthritis with swelling.

The inherent bias in the design of this research is obvious. The study directed a naïve population to be on the lookout for a new disease hallmarked by a specific type of rash shaped like a bulls-eye.

So what do you think got noticed by the physicians who participated in this study – the patients walking in the door with a bulls-eye rash, or the ones complaining about fatigue or headaches or pain in their non-swollen joints?

Before this investigation of the “Epidemiological Features of Lyme Disease in New York, the rate of association between an EM rash and Lyme disease symptoms ranged from 25-40%, as gleaned from a review of the published research from this period. In the New York study, 77% of the case reports were about people who exhibited an EM rash.

The perceived authority of this one study, published 33 years ago in 1984, serves as the ANCHOR for the misconception currently advanced by the CDC and other public health agencies, that 70-80% of the people who get Lyme disease will show a bulls-eye rash as a clear clinical sign.

Even though this assertion has been REPEATEDLY and REPRODUCIBLY shown to be false (with the true rate of association between and a bulls-eye shaped rash and a diagnosis of Lyme disease being only 10-40%), anchor bias perpetuates the myth that most people get an EM rash as a sign of “early” Lyme disease.

The bad news for patients is that since at least the late 1990s, the medical guidelines for diagnosing and treating Lyme disease patients have been based on clinical trials heavily influenced by this strong and pervasive anchor bias. Every research study that investigated the clinical course of Lyme disease in humans since the late 1970, used the appearance of a bull’s-eye rash as the main criteria for either inclusion in the study, or as an end point of the study.

Which means that all of the clinical research done to date has EXCLUDED from study 60-90% of people who actually have Lyme disease.

And even worse – a search of the NIH-funded clinical trials currently in the pipeline for Lyme disease returns with 20 studies currently enrolling or inviting participants. The “Inclusion Criteria” (to be eligible as a participant in the study) for these studies requires that a person must either meet the CDC case definition for Lyme disease, or meet the criteria set forth in the clinical practice guidelines developed by the Infectious Diseases Society of America, which are in practice one and the same. Briefly, those criteria are 1) the bulls-eye rash; and/or 2) “laboratory evidence” of infection.

“Laboratory evidence” is another way of saying “diagnostic test.” Diagnostic tests that would serve as laboratory evidence of an infectious disease like Lyme disease, either show direct evidence of infection with the bacteria causing the disease (such as growing the bacteria in culture or detecting their DNA or proteins in a blood sample), or indirectly demonstrate a past or present infection by measuring antibodies specific for the disease-causing agent in a person’s blood.

This latter method, called serology, is currently the ONLY type of laboratory testing recommended by the CDC for diagnosing a case of Lyme disease – even though serology has been REPEATEDLY and REPRODUCIBLY shown to be very inaccurate with a high rate of false negative tests (serology is falsely negative in 1 out of every 2 tests). A research paper just published takes it one step further and shows that serology is next to useless in persons who received antibiotic treatment before the test was done.

Ironically, a quote from the CDC website states: “Before CDC will recommend new tests, their performance must be demonstrated to be equal to or better than the results of the existing procedure, and they must be FDA approved.”

The explicit use of the term “FDA approved” by the CDC is interesting, because currently there are NO FDA APPROVED tests for Lyme disease, and that INCLUDES the serological tests the CDC recommends. Serology has been CLEARED by the FDA for marketing as a medical device, based on it being “substantially equivalent” to something already being marketed, which is, in essence serology itself, since serology was and is the only test in routine use across the globe.

FDA APPROVAL requires more than just a comparison to the existing standard, it requires additional evidence of the test’s safety and effectiveness. Serology, compared only to itself, has never actually gone through the FDA approval process.

This and other rhetorical twists of the existing science by the CDC has severely limited the use of any other test that could serve as “laboratory evidence” of Lyme disease, particularly ones which rely on the direct observation (such as culture or microscopic examination) or detection of biomolecules (such as DNA or RNA). Which is illogical, because direct detection of the microbe or molecules from it should yield no false positives, and therefore a person showing this type of laboratory evidence could be correctly diagnosed and treated.

What all this means is that we actually know next to nothing about the true nature of disease in persons infected with Borrelia or tick-borne coinfections, in the majority of persons who actually have Lyme disease. And if the status quo is maintained, we won’t be learning anything new from NIH-funded research on Lyme disease for the next 20 years.

If it was up to you to create an action plan for Lyme disease, what would you do? 

My action plan would start by making Lyme disease a national (and international) research priority, to the same extent that AIDS was prioritized in the 1980s. Given that there are annually more than 6 times the number of cases of Lyme disease as there are HIV/AIDS, with Lyme disease patients often experiencing a higher level of disability, this elevation in status is clearly warranted.

There are three areas related to tick-borne diseases that desperately need more research: diagnostics, treatment, and prevention. I would argue that diagnostics should be the first priority, because at this moment we are overly reliant on 40+ year old tests that are supposed to detect antibodies against a bacterium that can successfully “hide” from and even alter how and what types of antibodies are produced during an immune response to infection. There is currently no real way to differentiate between past or recent exposure to Borrelia in these tests, and no way to track the efficacy of treatments.

Once we have a way to directly detect infection – and I believe we are close to achieving that goal with several methods, including professor Laane’s work on a simple, direct method to detect the Borrelia with microscopy, direct detection of antigens, DNA sequencing, or nucleic acids from all tick-borne microbes – then it would be possible to reassess the existing dogma about the human course of this disease through well-designed, unbiased, hypothesis-driven research. Eva Sapi as another scientist using advanced microscopic methods for detection. This is the article describing her work on skin tissues.

The foundational research already exists – on bacteria grown in culture, and in animal models ranging from mice to dogs to non-human primates. Some of that research (new antibiotic dosing strategies, existing drugs with superior efficacy over the antibiotics currently medical guidelines recommend) is ready to advance to human clinical trials and only awaits funding.

Historically, research on preventing Lyme disease in humans has focused on vaccines and most recently, on a pre-exposure prophylactic (PrEP) that would render Borrelia burgdorferi incapable of causing an infection. The problem with this singular approach is that someone who is vaccinated or receives PrEP would NOT be protected against infection by other tick-borne microbes (such as other species of Borrelia, or Babesia, Bartonella, or Anaplasma) that also cause human diseases.

Existing research shows potential for a vaccine to prevent ticks from staying attached or transmitting microbes, and that type of vaccine deserves significantly more research attention, because it would reduce the human risk of acquiring any tick-borne disease, not just Lyme disease.

I would also argue that additional research is warranted to investigate other potential routes of transmission for the microbes labelled “tick-borne.” In the United States, CDC disease surveillance data reveals that Lyme disease is not just the “fastest growing vector borne disease,” it is the SECOND MOST COMMON infectious disease period, with only sexually-transmitted chlamydia causing more cases of disease per year. Gonorrhea comes in third.

Since there is scientific evidence of congenital transmission of Borrelia and research suggesting that sexual transmission occurs as well, it seems likely that Lyme disease is not all that “hard to catch” after all.

Professor Holly Ahern

Interviewer: Huib Kraaijeveld

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Save the Date – 3rd Rocky Mountain TBD Forum in May

SaveTheDate2018

Biologists at SF State Dig into Ticks and LD

http://news.sfsu.edu/news-story/biologists-sf-state-dig-ticks-and-lyme-disease

Woman wearing purple pullover and hat holds a pair of tweezers and a small lizard, with a forest in the background

Professor Andrea Swei prepares to pull a tick off a western fence lizard.

East Coast gets the limelight, but California’s ticks play by different rules

Lots of things probably come to mind when you think of Lyme disease, but California likely isn’t one of them. Most of the human cases of Lyme — and most research studies on it — happen in the northeastern U.S. But new work from San Francisco State University Biology Professor Andrea Swei and her former graduate student Jessica Kwan shows that the West Coast may have a thing or two to teach the East about the disease.

“The West Coast has been largely ignored,” said Swei. “And I think that’s a mistake.”

For Swei, California’s lower prevalence of Lyme is an opportunity to probe how the bacteria that causes the disease spreads differently on the West Coast. One leading explanation has to do with the different hosts that Lyme-carrying ticks prefer. In the Northeast, young ticks like to feed on the blood of small mammals like mice and chipmunks. In California, however, they have another favorite: western fence lizards. These lizards have unique blood that actually kills off the Lyme bacteria present in ticks, essentially un-infecting them.

That got Kwan thinking. If the Lyme disease bacteria dies when its host feeds on a lizard, what happens to all the rest of the tick’s microbial residents? After all, the whole community of microbes in a tick — what scientists call its “microbiome” — could affect whether Lyme-causing bacteria thrive.

The team, with Kwan at the helm, captured western black-legged ticks from around Marin County both by dragging nets through vegetation and by pulling them off lizards. They also raised some in the lab. The team then tested tens of millions of snippets of bacteria DNA from the ticks and organized these snippets by how similar they were to one another. That gave them an idea of the diversity of microbial life that was living in each tick, and how that diversity changed over the ticks’ lives.

They found that ticks harboring a less diverse community of microbes were more likely to be infected with the Lyme pathogen, and that those microbe communities actually became less diverse as the ticks fed and grew.This came as a surprise — both findings ran counter to research done back east. “We were thinking in the East Coast model,” explained Kwan. California ticks, apparently, play by different rules.

The results also hint at a more complicated role for western fence lizards in the transmission of Lyme. “They’ve been touted as this secret weapon against the Lyme disease bacteria,” Swei explained. But if they make the whole microbiome of a feeding tick less diverse, that tick may actually be more likely to harbor and spread the bacteria that causes the disease.

Swei and her team plan to keep on probing the unique California Lyme disease system. Armed with new data, they’ll keep investigating this more complicated picture of the western fence lizard’s role. They even plan to look at how different strains of the same species of Lyme-causing bacteria could change how the disease spreads. “There’s a lot we can still learn from the system here,” says Swei.

The work was published on Nov. 28 in the journal Molecular Ecology and was funded by the National Science Foundation.

_____________

LYME IS NOT RARE IN CALIFORNIA.  IN FACT IT’s EVERYWHERE BUT ANTARCTICA, but give it time and it will be there too.  

The myths must stop!

Study found here:  https://madisonarealymesupportgroup.com/2017/12/03/vertical-vs-horizontal-transmission-of-the-microbiome-in-a-key-disease-vector-ixodes-pacificus/, along with other links on ticks in the comment section after the study.

Please know that Andrew Spielman’s tick maps have been used for decades against patients.  Doctors look at the flawed maps and proclaim, “Lyme isn’t here because the tick isn’t here.”  That is getting blown out of the water on a daily basis.

https://madisonarealymesupportgroup.com/2017/08/05/cdc-maps-for-lyme-disease-not-accurate/

https://madisonarealymesupportgroup.com/2016/09/24/arkansas-kids-denied-lyme-treatment/

https://madisonarealymesupportgroup.com/2016/11/03/ld-not-in-australia-here-we-go-again/

https://madisonarealymesupportgroup.com/2017/10/24/no-lyme-in-oklahoma-yeah-right/ Explains about Spielman’s maps – 

Spielman’s triumphant discovery was short-lived….

Tick expert James H. Oliver states:

“When I started working in this area, I was told, point blank, Lyme disease was not in the South, and human Lyme disease could not occur — there were no ticks and no germs,” he recalls. But he was not convinced that the blacklegged ticks in the North and South differed much — or that Spielman’s discovery represented a separate species at all.

In a series of experiments from 1989-1990, Oliver demonstrated that so-called Northern deer ticks (dammini) and the blacklegged ticks (scapularis) found up and down the East Coast bit exactly the same animals in the lab. In 1992, he showed that even ticks from widely separated areas like Georgia and Massachusetts were genetically too similar to be different species. And breeding ticks from the North and South in the lab, Oliver demonstrated that a series of matings produced reliably fertile offspring — a crucial test of species boundaries.

Oliver’s definitive experiments blew up the idea that dammini was a new or separate species. The name dammini was dropped from the scientific literature. But Spielman’s framework — restricting Lyme to the Northern ticks — remained intact.

The notion that the ticks in the North and the South were fundamentally different still lies at the heart of the controversy over Southern Lyme. Oliver attributed most of those differences to Southern heat: To avoid it, scapularis nymphs hide out under leaf litter, biting lizards and small mammals instead of questing for larger prey on tall grass or brush.  http://steveclarknd.com/wp-content/uploads/2013/11/The-Confounding-Debate-Over-Lyme-Disease-in-the-South-DiscoverMagazine.com_.pdf

 

Vertical vs. Horizontal Transmission of the Microbiome in a Key Disease Vector – Ixodes Pacificus

Vertical vs. horizontal transmission of the microbiome in a key disease vector, Ixodes pacificus

Kwan JY, Griggs R, Chicana B, Miller C, Swei A. Vertical vs. horizontal transmission of the microbiome in a key disease vector, Ixodes pacificus. Mol Ecol. 2017;00:1–12. https://doi.org/10.1111/mec.14391

First published: 

Abstract

Vector-borne pathogens are increasingly found to interact with the vector’s microbiome, influencing disease transmission dynamics. However, the processes that regulate the formation and development of the microbiome are largely unexplored for most tick species, an emerging group of disease vectors. It is not known how much of the tick microbiome is acquired through vertical transmission vs. horizontally from the environment or interactions with bloodmeal sources. Using 16S rRNA sequencing, we examined the microbiome of Ixodes pacificus, the vector of Lyme disease in the western USA, across life stages and infection status. We also characterized microbiome diversity in field and laboratory-collected nymphal ticks to determine how the surrounding environment affects microbiome diversity. We found a decrease in both species richness and evenness as the tick matures from larva to adult. When the dominant Rickettsial endosymbiont was computationally removed from the tick microbial community, we found that infected nymphs had lower species evenness than uninfected ticks, suggesting that lower microbiome diversity is associated with pathogen transmission in wild-type ticks. Furthermore, laboratory-reared nymph microbiome diversity was found to be compositionally distinct and significantly depauperate (lacking in numbers or species) relative to field-collected nymphs. These results highlight unique patterns in the microbial community of I. pacificusthat is distinct from other tick species. We provide strong evidence that ticks acquire a significant portion of their microbiome through exposure to their environment despite a loss of overall diversity through life stages. We provide evidence that loss of microbial diversity is at least in part due to elimination of microbial diversity with bloodmeal feeding but other factors may also play a role.

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More on ticks:  https://madisonarealymesupportgroup.com/2017/10/04/droplet-digital-pcr-shows-60-bb-infection-rate-in-ticks-and-over-50000-spirochetes-per-adult-tick/

https://madisonarealymesupportgroup.com/2017/07/01/one-tick-bite-could-put-you-at-risk-for-at-least-6-different-diseases/

https://madisonarealymesupportgroup.com/2017/05/01/co-infection-of-ticks-the-rule-rather-than-the-exception/

https://madisonarealymesupportgroup.com/2017/08/17/of-birds-and-ticks/

https://madisonarealymesupportgroup.com/2017/07/30/ticks-found-on-eyeball-buttocks-and-penis/

https://madisonarealymesupportgroup.com/2017/10/27/israeli-kids-get-lyme-disease-from-ticks-in-caves/

https://madisonarealymesupportgroup.com/2017/11/28/rick-factors-for-tick-exposure/

https://madisonarealymesupportgroup.com/2017/03/13/ticks-found-on-rocks/