for the 8th International Meeting on Molecular Epidemiology and Evolutionary Genetics in Infectious Diseases Royal River Hotel, Bangkok, Thailand, 30 Novemberâ2 December 2006 Available online 20 January 2008 Plenary lectures The molecular epidemiology of enteric protozoan infectionsâEmerging issues and paradigm shifts R.C. Andrew Thompson World Health Organization Collaborating Centre for the Molecular Epidemiology of Parasitic Infections, School of Veterinary and Biomedical Sciences, Murdoch University, Murdoch, WA 6150, Australia. In recent years a variety of issues have emerged concerning the epidemiology of zoonotic protozoan infections that result from the ingestion of environmentally resistant infective stages. They have many features in common regarding their transmission, which can be direct, or via water or food, and most exhibit low host speciï¬city. Although they have been the subject of research for many years, recent studies have raised fundamental questions concerning our understanding of the epidemiology of infections with these parasites. Giardia and Blastocystis both have wide host ranges and are genetically very divergent yet how this variability is reï¬ected in terms of zoonotic potential, clinical signiï¬cance and virulence is not clear. With Cryptosporidium, many taxonomic and epidemiological questions have been resolved but recent studies have not only questioned Cryptosporidiumâs phylogenetic afï¬nities, but
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