Скачать или смотреть West Nile Virus Transmission and Effects on Animals

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Jays and Crows are the primary vertebrate reservoirs for West Nile virus. West Nile virus is mainly transmitted by mosquitoes. In North America alone, there is evidence of infection in at least 59 species, including Culex and Aedes. Some female mosquitoes feed only on birds, like they are ornithophilic. However, some feed on the birds and other species, transmitting West Nile virus to humans, horses, and other animals. The viremia that results in humans, horses, and other animals is insufficient for West Nile virus transmission, making them incidental hosts. This is a schematic diagram that gives a general representation of the transmission of West Nile virus. Most of the horses are infected asymptomatically. In clinical cases, the illness is characterized by anorexia, depression, and neurological signs, which may include ataxia, weakness or paralysis of one or more limbs, teeth grinding, aimless wandering, convulsions, and circling. Tremors of the face and neck muscles are very common. Some animals have cranial nerve deficits