EMCV was isolated from western harvest mice (Reithrodontomys megalotis), in El Moro Canyon in southeastern Colorado in 1995.
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These include El Moro Canyon virus associated with the western harvest mouse, Reithrodontomys megalotis, Tula virus with Microtus arvalis and M. rossiaemeridionalis, Rio Segundo virus with the Mexican harvest mouse, R. mexicanus, Isla Vista virus with the California vole, M. californicus, and Prospect Hill-like viruses in Microtus species.