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Dead horse that was a victim of a Venezuelan equine encephalitis outbreak in Texas

As in humans, under natural conditions (as opposed to the artificial condition of bioweapons use), the etiologic pathogens responsible for equine encephalitic diseases are transmitted to horses by mosquito vectors, with various bird species serving as reservoirs. Photograph by CDC/James Stewart in 1976. (Source: Public Health Image Library, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia. Image 2809. Public domain.)

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