West Nile virus is spread by the bite of an infected mosquito, and can infect people, horses, many types of birds, and some other animals. Most people who become infected with West Nile virus will have either no symptoms or only mild ones. However, on rare occasions, West Nile virus infection can result in severe and sometimes fatal illnesses. There is no evidence to suggest that West Nile virus can be spread from person to person or from animal to person.

Overview of West Nile Virus Updated

Q: What are West Nile virus, West Nile fever, and West Nile encephalitis?

A."West Nile Virus" is a flavivirus commonly found in Africa, West Asia, and the Middle East. It is closely related to St. Louis encephalitis virus found in the United States. The virus can infect humans, birds, mosquitoes, horses and some other mammals.

"West Nile fever" is a case of mild disease in people, characterized by flu-like symptoms. West Nile fever typically lasts only a few days and does not appear to cause any long-term health effects.

More severe disease due to a person being infected with this virus can be "West Nile encephalitis," "West Nile meningitis" or "West Nile meningoencephalitis." Encephalitis

Q. Is the disease seasonal in its occurrence?

The risk of severe disease is higher for persons 50 years of age and older. It is unknown if persons with compromised immune systems are at increased risk for WNV disease.

· Produces a bite less severe than other, better-known mosquitoes such as the salt marsh mosquito.

· Consider staying indoors at dawn, dusk, and in the early evening, which are peak mosquito biting times.

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