Before 1999, however, West Nile virus had never before been found in the Americas. The most likely explanation for its appearance here is that the virus was introduced by an infected bird that was imported or an infected person returning from a country where the virus is common. However, dead birds can carry a variety of diseases and, therefore, should never be handled with bare hands. Use gloves to carefully place dead birds in double-plastic bags and then place in the outdoor trash. There is no evidence to suggest that ticks or other insects transmit West Nile virus.
Some persons also develop a mild rash or swollen lymph glands.
In some individuals, particularly the elderly, West Nile virus can cause serious disease that affects brain tissue. At its most serious, it can cause permanent neurological damage and can be fatal. There is no documented evidence that a pregnant woman or her fetus are at increased risk due to infection with West Nile virus. There is no specific therapy. A vaccine for West Nile virus does not exist.