Causes
By Mayo Clinic staffThe plague bacteria, Yersinia pestis, is transmitted to humans when they are bitten by fleas that have previously fed on infected animals, such as:
- Rats
- Squirrels
- Rabbits
- Prairie dogs
- Chipmunks
The bacteria can also enter your body if you have a break in your skin that comes into contact with an infected animal's blood. Domestic cats can become infected with plague from flea bites or from eating infected rodents.
Pneumonic plague, which affects the lungs, is spread by inhaling infectious droplets coughed into the air by a sick animal or person.
- Everett ED. Microbiology, pathogenesis and epidemiology of plague (Yersinia pestis infection). http://www.uptodate.com/home/index.html. Accessed June 17, 2010.
- Gage KL. Plague and other Yersinia infections. In: Goldman L, et al. Cecil Medicine. 23rd ed. Philadelphia, Pa.: Saunders Elsevier; 2007. http://www.mdconsult.com/das/book/body/206594927-5/1015859897/1492/1167.html#4-u1.0-B978-1-4160-2805-5..50338-4_14426. Accessed June 17, 2010.
- Everett ED. Clinical manifestations, diagnosis and treatment of plague (Yersinia pestis infection). http://www.uptodate.com/home/index.html. Accessed June 17, 2010.
- Plague fact sheet. National Park Service. http://www.nps.gov/public_health/info/factsheets/fs_plague.htm. Accessed June 18, 2010.
- Frequently asked questions (FAQ) about plague. Centers for Disease Control and Prevention. http://www.bt.cdc.gov/agent/plague/faq.asp. Accessed June 18, 2010.
- Information on plague. Center for Disease Control and Prevention. http://www.cdc.gov/ncidod/dvbid/plague.info.htm. Accessed June 18, 2010.
- Interregional meeting on prevention and control of plague. World Health Organization. http://www.who.int/csr/resources/publications/WHO_HSE_EPR_2008_3w.pdf. Accessed June 21, 2010.
- Plague fact sheet. Centers for Disease Control and Prevention. http://www.cdc.gov/ncidod/dvbid/plague/qa.htm. Accessed June 21, 2010.

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