Books > Science & Mathematics > Biology, life sciences > Zoology & animal sciences > Invertebrates > Insects (entomology)
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Diseases of Mites and Ticks (Hardcover, 2009 ed.)
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Diseases of Mites and Ticks (Hardcover, 2009 ed.)
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Total price: R4,297
Discovery Miles: 42 970
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Ticks transmit a greater variety of pathogens than any other group
of hemotophagous arthropods (Sonenshine 1993). In ticks, the midgut
is the ?rst site of exposure to a wide variety of hemoparasites
that may be ingested with the bloodmeal. Some of these he-
parasites are either not infective for ticks and rapidly digested
or cleared by the innate tick immune system. Others infect midgut
epithelial cells where they multiply and subsequently infect other
tissues including the salivary glands. Transmission may occur when
the tick is ingested by the vertebrate host or from salivary glands
via the saliva to vertebrate hosts when the tick feeds again.
Tick-borne pathogens have apparently co-evolved with ticks for
their mutual survival because, while pathogens undergo considerable
multiplication in ticks, these infections do not appear to be
detrimental to tick feeding or their biology (Kocan et al. 1992a,
2005; Sonenshine et al. 2005). Among the various tick-borne
pathogens, those belonging to the genus Anaplasma (Rickettsiales:
Anaplasmataceae) are obligate intracellular organisms found
exclusively within parasitophorous vacuoles in the cytoplasm of
both vertebrate and tick host cells (Kocan 1986; Dumler et al.
2001). The type species, A. marginale, causes the econo- cally
important cattle disease, anaplasmosis, with Dermacentor variabilis
comprising one of the main tick vectors of this pathogen in the USA
(Kocan et al. 2004).
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