Ecology
Enzootic Cycle
![mice in feild representing enzootic transmission of hantaviruses](https://webarchive.library.unt.edu/web/20120925031152im_/http://www.cdc.gov/hantavirus/images/technical/hanta/enzootic.jpg)
Local enzootic transmission of hantaviruses occurs at low levels during periods of unfavorable environmental conditions.
Many hantaviruses are known to cause hantavirus pulmonary syndrome (HPS). Each virus has a single primary host. The most important hantavirus in the US is the Sin Nombre virus, hosted by the deer mouse.
Epizootic Cycle
![mice in field representing epizootic cycle of hantavirus transmission](https://webarchive.library.unt.edu/web/20120925031152im_/http://www.cdc.gov/hantavirus/images/technical/hanta/epizootic.jpg)
The virus is maintained and transmitted by host reservoir rodents by horizontal transmission (aggressive behavior, biting).
Favorable environmental conditions such as mild winters and summer rainfall may cause dramatic increases in rodent populations. More rodents become infected under crowded conditions. Deer mice may enter human structures in rural areas. Humans may become infected when they inhale airborne virus or come into direct contact with infected rodents or their urine, feces, or nests. Other mammal species (cats, dogs, coyotes) may be infected through contact with rodent hosts, but they are not known to transmit the virus.
Get email updates
To receive email updates about this page, enter your email address:
Contact Us:
- Centers for Disease Control and Prevention
Viral Special Pathogens Branch
1600 Clifton Rd
Atlanta, GA 30333 - Hantavirus Hotline
(877) 232-3322
(404) 639-1510 - 800-CDC-INFO
(800-232-4636)
TTY: (888) 232-6348 - cdcinfo@cdc.gov
- About VSPB (Viral Special Pathogens Branch)