LOOKING AT LYME DISEASE - MSIDS: prophylactic treatment

Showing posts with label prophylactic treatment. Show all posts

Wednesday, 21 March 2012

PROPHYLACTIC TREATMENT WAS TOTALLY INEFFECTIVE WHEN DELIVERED 2 DAYS (48HRS) AFTER TICK REMOVAL

Since 2001 the Infectious Diseases Society of America (IDSA) has been recommending preventive treatment of a single dose of doxycyline for tickbites under certain narrow conditions:- The IDSA recommends preventive treatment with antibiotics only in people who meet ALL of the following criteria:
- Attached tick identified as an adult or nymphal I. scapularis (deer) tick
- Tick is estimated to have been attached for ≥36 hours (based upon how engorged the tick appears or the amount of time since outdoor exposure)
- Antibiotic treatment can begin within 72 hours of tick removal
- The local rate of tick infection with B. burgdorferi is ≥20 percent (known to occur in parts of New England, parts of the mid-Atlantic states, and parts of Minnesota and Wisconsin)
- The person can take doxycycline (eg, the person is not pregnant or breastfeeding or a child <8 years of age)

Piesman et al. have just published a new article concluding that if the treatment is given as little as 24 hours after the bite, only 47% of the mice were cured.

Piesman also concludes that "Prophylactic treatment was totally ineffective when delivered ≥2days (48hrs) after tick removal."

The IDSA recommends treating if * Tick is estimated to have been attached for ≥36 hours (based upon how engorged the tick appears or the amount of time since outdoor exposure) * Antibiotic treatment can begin within 72 hours of tick removal

IDSA recommends "If the person meets ALL of the above criteria, the recommended doseof doxycycline is a single dose of 200 mg for adults and 4 mg/kg, up to a maximum doseof 200 mg, in children ≥ 8 years"

In 2004 Zeidner et al. noted that the "sustained release" doxy was curative, but regular doxy only 43% effective. [Antimicrob Agents Chemother. 2004Jul;48(7):2697-9. Sustained-release formulation of *doxycycline* hyclate for prophylaxis of tick bite infection in a murine model of Lyme borreliosis.]

In 2008 Dolan et al. reported on the success of 14 days of exposure to antibiotic bait formulations.. Am J Trop Med Hyg. link 2008 May;78(5):803-5. A doxycycline hyclate rodent bait formulation for prophylaxis and treatment of tick-transmitted Borrelia burgdorferi.

Dolan MC link ,
Zeidner NS link ,
Gabitzsch E link ,
Dietrich G link ,
Borchert JN link ,
Poché RM link;,
Piesman J link
Abstract
The prophylacticand curative potential of doxycycline hyclate formulated in a rodent bait at concentrations of 250 and 500 mg/Kg was evaluated in a murine model of Lyme borreliosis. Both bait formulations preventedtick-transmitted Borrelia burgdorferi infection in 100% of C3H/HeJ mice (N = 16), as well as cured acute, established infection in mice (N = 8) exposed to bait for 14 days. Spirochete infection was cleared in 88.9% to 100% of infected nymphs feeding on mice fed 250 and 500 mg/Kg antibiotic bait formulations, respectively. These data provide evidence for exploring alternative techniques to prevent transmission of Lyme disease spirochetes.

This month Peisman and Hoigaard note that "prophylactic treatment was totally ineffective when delivered ≥2days after tickremoval." [2 days = 48 hrs] Ticks Tick Borne Dis. link 2012 Mar 13. [Epub ahead of print]

Protective value of prophylactic antibiotic treatment of tick bite for Lyme disease prevention: An animal model.
Piesman J link ,
Hojgaard A link .

Abstract
Clinical studies have demonstrated that prophylactic antibiotic treatment of tick bites by Ixodes scapularis in Lyme disease hyperendemic regions in the northeastern United States can be effective in preventing infection with Borrelia burgdorferi sensu stricto, the Lyme disease spirochete. A large clinical trial in Westchester County, NY (USA), demonstrated that treatment of tick bite with 200mg of oral doxycyclinewas 87% effective in preventing Lyme disease in tick-bite victims (Nadelman, R.B., Nowakowski, J., Fish, D., Falco, R.C., Freeman, K., McKenna, D., Welch, P., Marcus, R., Agúero-Rosenfeld, M.E., Dennis, D.T., Wormser, G.P., 2001. Prophylaxis with single-dose doxycyclinefor the prevention of Lyme disease after an Ixodes scapularis tick bite. N. Engl. J. Med. 345, 79-84.). Although this excellent clinical trial provided much needed information, the authors enrolled subjects if the tick bite occurred within 3days of their clinical visit, but did not analyze the data based on the exact time between tick removal and delivery of prophylaxis. An animal model allows for controlled experiments designed to determine the point in time after tick bite when delivery of oral antibiotics would be too late to prevent infection with B. burgdorferi. Accordingly, we developed a tick-bite prophylaxis model in mice that gave a level of prophylactic protection similar to what had been observed in clinical trials and then varied the time post tick bite of antibiotic delivery. We found that two treatments of doxycycline delivered by oral gavage to mice on the day of removal of a single potentially infectious nymphal I. scapularis protected 74% of test mice compared to controls. When treatment was delayed until 24h after tick removal, only 47% of mice were protected; prophylactic treatment was totally ineffective when delivered ≥2days after tick removal. Although the dynamics of antibiotic treatment in mice may differ from humans, and translation of animal studies to patient management must be approached with caution, we believe our results emphasize the point that antibiotic prophylactic treatment of tick biteto prevent Lyme disease is more likely to be efficacious if delivered promptly after potentially infectious ticks are removed from patients. There is only a very narrow window for prophylactic treatment to be effective post tick removal.

In the past 11 years, the misinformation has spread widely on the internet. Your mission, should you choose to accept it, is to seek out sites displaying the inaccurate information and ask them to correct it. Let's see if we can turn this around before another 11 years goes by. You will be saving lives.

Thanks to Phyllis Mervine Lyme Disease.org for this information

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Lyme Life written in 2009

I started suffering with arthritis in mainly my large joints especially my knees 6 years ago. The symptoms varied and I remember saying that every joint was affected except my elbows to one doctor. I was told it would be hormonal and to take the usual supplements cod liver oil or glucosamine ( I would certainly recommend buying shares in the companies producing these supplements) They had no noticeable affect.

All my symptoms deteriorated significantly over a few weeks,4 years ago. Hips shoulders and knees being the worst and I started with muscle weakness in upper arms and upper legs. I had difficulty standing and walking across a room. I was unable to walk upstairs and my husband was making plans to convert to a downstairs bedroom. I had seen 5 doctors and 3 Rheumatologists and put on steroids for Poly Myalgia Rheumatica diagnosis. I had been diagnosed with Fibromyalgia and ME/CFS.

I have X rays and scans showing signs of osteoarthritis and Rheumatoid arthritis. ( later note.- the X rays done some years into treatment showed my hands completely normal no signs of inflammation or RA confirming how they felt - normal) I have been retired early from the Civil Service having lost my job not to mention my earning potential. My illness seemed to progress through my body not affecting the same joints left to right at the same time. I had bursitis in left hip, right hip, left elbow. I had synovial thickening in both wrists. At that time I could not lift and hold a magazine so lifting a kettle I could only do if a third full and with two hands. Each joint in my hands fingers feet and toes were affected. I had swallowing difficulties and many other symptoms. None of this describes the endless and awful pain whenever I moved or the tiredness but inability to get quality sleep.

Two years ago my GP gave me Amoxicilin for a sinus/throat/chest infection. All my arthritis symptoms improved. The course ended the symptoms deteriorated I started a second course the symptoms improved. The improvement was more significant than when I had started taking steroids. This led my GP to suspect Lyme Disease. I laughed because we do not travel abroad but she said they had had other cases in the surgery in the early stages of tick bite and Erythma Migrans rash. She said but you have not had a bite. I said oh yes I have I had two on my ankles with rashes, March 05 this was confirmed on her computer when I had seen a locum doctor. My worst symptoms were waking up feeling rigid and having to painfully flex every joint in my body before struggling to get up. The only other time I had experienced this was in May 2003 during a flu like illness like no other I had ever experienced. At that time I had a bite and similar rash on my right foot which lasted like the other rashes about four weeks. I had also consulted the surgery and it was dismissed as a virus. I walked our dog daily in the woods adjacent to our house where the deer roam, prime tick area. Thus started my very lengthy search about Lyme Disease leading me through Lyme Disease Action to a doctor who specialises in this illness. He confirmed my GP's suspicions. I never had a positive blood test but then they are antigen tests and there is much research that shows they are unreliable. In my case the year of steroids and many weeks antibiotics could have affected the results. So with a clinical diagnosis and following ILADS International Lyme and Associated Disease Society guidelines I continued on antibiotics for two years. Both my doctors continued to treat me despite of Health Protection Agency advising against long term antibiotics. I am now nearly 100% recovered I have no pain or muscle weakness. I can walk upstairs something I could not do for three and a half years. I can garden do house work and live a normal life. I still need to pace myself and with only a few months to 60 will not be looking to return to work. Life is such a joy. Sadly there is much controversy about Lyme Disease and doctors in UK are taught that it is so rare. Well where I live in Guildford I have been in contact with a dozen other people with it so perhaps not so rare as HPA would like us to believe. I am in touch with nearly 2000 other patients through a chat line Eurolyme most had been misdiagnosed with several other illnesses. Look at UK charity Lyme Disease Action if you want to read more about this illness. There are many MP's taking an interest in the problems surrounding diagnosis and treatment see above charity links into a recent meeting at the House of Commons.

Thank goodness there are some thinking doctors around who have courageously treated me against opposition and I have made such a miraculous recovery albeit rather a lengthy one. One day there will be many more people who are helped with their chronic illnesses when IDSA starts taking note of what our courageous LLMD’s are doing following ILADS Guidelines.

ME/CFS, Fibromyalgia, Poly Myalgia Rheumatica, Arthritis, Bell’s Palsy, MS,MN, ALS, Parkinson’s, Alzheimer’s, Heart Block, Stroke, Psychiatric, gastric problems the list is endless. Not all suffering from Lyme Borrelia but how many are even properly assessed for it.

UPDATE

UPDATE 10 January 2012