15841 - Ticks Paul R Earl Facultad de Ciencias Biolgicas...

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Unformatted text preview: Ticks Paul R Earl Facultad de Ciencias Biolgicas Universidad Autnoma de Nuevo Len San Nicols, NL, Mexico TICKS are universaly distributed ectoparasites of vertebrates that take blood and lymph from them. They are related to mites and distantly to spiders. They are vectors of many microbial pathogens. About 850 species have been described, and the most important in Europe, the Far East and the New World are Ixodes species. Try The Ticks of the World (Acarida, Ixodida). Nomenclature, Described stages, Hosts, Distribution (Including new species described before 1/01/96) by JL Camicas, JP Hervy, F. Adam, PC Morel. Ed Orstom, Paris, 1998. Ixodes ticks transmit the spirochete Borrelia burgdorferi of Lyme disease in Eurasia and North America, tick-borne encephalitis virus (TBEV) in Europe and Asia, human babesiosis, caused by Babesia microti and B. bovis to man in North America, Babesia divergens in Europe and B. bigemina & B. bovis in Mexico. Human granulocytic ehrlichiosis (HGE) now called human anaplasmosis is caused by Anaplasma phagocytophila, A. equi & HGE agent in North America and Europe. The pathogens Bartonella spp., Francisella tularensis, Coxiella burnetii and Rickettsia spp. cause tularaemia, Q-fever and tick-borne lymphadenopathy (TIBOLA) are importance. Tick biology Ticks are arachnids that comprise 2 major families: the Ixodidae (ixodid or hard ticks), having a dorsal shield (scutum), and the Argasidae (argasid or soft ticks). These 2 general taxonomic categories differ in form, behavior, pattern of development, and disease relationship. Ixodes ricinus is equipped with long cheliceras and the central hypopharynx: the piercing and sucking mouthparts. The hypostome is equipped with recurved spines....
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15841 - Ticks Paul R Earl Facultad de Ciencias Biolgicas...

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