artur737
06.11.06, 17:41
The LDA and ILADS conferences Philadelphia 2006 - Summary
The LDA conference
Pat Smith, president of the LDA, opened the conference with a talk about the activities of the LDA during 2005. As usual the organisation has been highly active throughout the States. In addition Pat Smith has noted more global interest in Lyme. For example she stated the WHO in its sixth report from the Millennium Ecosystem Assessment referred to an increase in “insect borne diseases such as Lyme and malaria”.
Comment: Hopefully someone has now explained to the WHO the difference between a tick and an insect.
David Ecker PhD gave the first keynote talk to the conference. At Ibis Biosciences he has been leading a large team who have developed a new technique referred to as Universal Biosensor Detection. Developed in response to a possible bioterrorism threat the DNA based technology is able to rapidly screen for numerous micro-organisms simultaneously. It has already been used for actual disease outbreaks such as one in US Marine recruits at MCRD in 2002. One interesting finding from this study was that the outbreak appeared to be due to not one but three different bacteria.
Comment: Outbreaks of infectious disease are normally assumed to be due to one particular strain of an organism which may have mutated into a virulent form. This technology may change this view. It is relevant to Lyme disease because it is increasingly being recognised that Lyme disease patients carry other tick borne pathogens which are contributing to the clinical picture. If the technology could be used to rapidly detect co-infections in Lyme there is no doubt this would be of great value to physicians.
PCR testing for Borreliosis holds the most promise for the laboratory diagnosis of Lyme disease but the test lacks clinical sensitivity particularly if blood is used as the testing medium. Roger Lasken PhD described a new technique of Multiple Displacement Amplification whereby sample DNA is pre-amplified en masse to increase DNA copies to be PCR tested. There appears to be no loss of fidelity.
Comment: If this technology can truly increase the ‘pick up rate’ for Borrelia PCR testing then commercial interests and/or politics must not be allowed to interfere. Patients need this technology now if it works.
Keith Clay PhD has been studying microbial diversity in ticks. Increasing numbers of tick borne pathogens are being identified and Dr. Clay has used molecular biological techniques to determine the full bacterial complements being harboured within ticks. It has been found that the range of organisms is large and goes well beyond known pathogens.
Comment: Although most of the microbes appear to be symbionts or commensals within the tick it is possible some may prove to be human pathogens. Clearly this will be an important area for further research.
Recognising that co-morbidity can and does occur Lyme physicians have been treating some ALS patients with IV Ceftriaxone for years but it seems that
Jeffrey D Rothstein MD will get credit for discovering that this agent can help stop progression of this terrible condition. Using a mouse model of ALS numerous known therapeutic agents were tested and it was shown that beta lactam antibiotics had the greatest effect. Dr. Rothstein believes the effect is due to the known ability of this group of agents to stimulate a particular Glutamate transporter protein, GLT 1, so reducing Glutamate neurotoxicity in the CNS.
Comment: It is many years since Minocin was shown to be of value in Rheumatoid Arthritis patients. It was, and still is, held that this effect is due to the anti-inflammatory effect of the compound not an anti-bacterial effect. It is all starting to look rather suspicious.
Elisabeth Aberer MD talked about Lyme Borreliosis in Europe. Her background in dermatology appears to help her to diagnose EM and ACA and she has been studying the variable morphological forms of Borrelia in vitro in an attempt to understand more about persistent infection.
Manuel Moro DVM has been studying the effects of co-infection of Babesia microti and Borrelia infection in the murine host. Increased levels of carditis and arthritis were found with co-infected hosts correlating with an increase in TNF alpha and a decrease in IL4.
Daniel Cameron MD informed us that the double blind placebo controlled study he reported in 2005 has not yet been published but Dr. Cameron has a different paper in press which he presented. The case controlled study suggests that delayed treatment of Lyme disease is a risk factor for treatment failure.
Comment: Most doctors agree that early treatment of Lyme disease may prevent establishment of a chronic form of the disease but evidence is sparse and this study is most welcome.
Diego Cadavid MD has been studying the effects of Borrelia infection in mice and monkeys in the laboratory. A striking finding was that increased tissue destruction and slower clearance of organisms were found in hosts immunocompromised with the steroid dexamethasone.