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Western equine encephalitis virus cycle in Western United States

This diagram illustrates the methods by which the arbovirus Western equine encephalitis virus reproduces and amplifies itself in both avian and rodent populations and is subsequently transmitted by the Culex tarsalis mosquito to dead-end hosts, including humans and horses. Image by CDC/Dr. Thomas Monath in 1976. (Source: Public Health Image Library, U.S. Centers for Disease Control and Prevention, Atlanta, Georgia. Image 14996. Public domain.)

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