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Update is appreciated; CDC often lags behind2014-06-17 11:03:33ashley


Jeff, thanks for the update on Lyme disease. I hope I got across the point that anyone who is the victim of a tick bite should watch for symptoms of disease no matter how long the tick is presumed to be attached. Outside of a laboratory setting that time frame may not be ascertainable.
Updated: 2014-06-17 12:03:14


 
Current scientific information2014-06-16 21:50:12jeff-lan


Most studies related to transmission of Lyme disease bacteria by tick bite were done in the 1980s, based solely on one bacterial species (Borrelia burgdorferi), and were done with mice. Since then, studies have shown that other Borrelia species may be transmitted to the host “earlier” than the stated 36 to 48 hours. One recent study involving humans demonstrates transmission of Borrelia to human hosts in 4-12 hours post-attachment. Additionally, while there are no studies that specify the time a tick must be attached for transmission of other microbial agents, it is known that Powassen virus, which can cause deadly encephalitis, is transmitted shortly (within 15 minutes) after the tick begins to bite. Healthcare providers should not minimize the risk of contracting Lyme disease or other tick-borne diseases from an attached tick, regardless of the time. *** The following are references to studies on the issue published in peer-reviewed scientific and medical journals: *** Crippa, M., Rais, O., Gern, L. (2002) Investigations on the mode and dynamics of transmission and infectivity of Borrelia burgdorferi sensu stricto and Borrelia afzelii in Ixodes ricinus ticks. Vector Borne Zoonotic Diseases 2(1): 3-9. *** Hynote, E.D., Mervine, P.C., Stricker, R.B. (2012) Clinical evidence for rapid transmission of Lyme disease following a tickbite. Diagnostic Microbiology & Infectious Disease 72(2): 188-192. *** Ebel, G.D., Kramer, L.D. (2004) Short report: duration of tick attachment required for transmission of powassan virus by deer ticks. American Journal of Tropical Medicine and Hygeine. 71(3): 268-71. *** A summary of important information concerning Lyme Disease and other tick-borne diseases is available in video format that can be viewed in less than 5 minutes: "What Is Lyme Disease: An evidence-based exploration of the concepts and common medical misconceptions of Lyme disease" http://youtu.be/tX70ivbRyJ4 Updated: 2014-06-16 09:51:05Updated: 2014-06-16 09:52:05Updated: 2014-06-16 09:53:32
Updated: 2014-06-16 09:55:56