Eastern equine encephalitis, dengue fever and West Nile virus are the most common mosquito-borne diseases in the US. Here's what you need to know about mosquitoes as fall gets underway.

Metro West Nile virus kills 2 in New Jersey as death toll across US rises to 5 By Chris Harris Published Aug. 31, 2024, 1:28 p.m. ET ...

West Nile virus showed up in Shasta County mosquitoes for the first time in 2025, according to Shasta Mosquito and Vector Control District, putting people at risk of being bitten and catching the ...

There have been 216 West Nile cases so far this year. West Nile virus was first reported in the U.S. in 1999 in New York. It gradually spread across the country. In 2003, there were nearly 10,000 ...

West Nile could cause serious illness and complications, including encephalitis, or inflammation of the brain, or meningitis, which is an inflammation of the lining of the brain and spinal cord.

The vast majority of humans infected by West Nile virus either have no symptoms at all or minor flulike symptoms. Less than 1% of people develop severe illness from West Nile virus.

West Nile virus is spread to people from infected mosquitoes, most commonly in the summer. Eight out of 10 people infected do not develop symptoms, according to the CDC.

The average number of West Nile virus cases in the U.S. varies annually, but the CDC reports that in 2022, 1,132 cases were reported. The disease is most common during the summer and early fall ...

West Nile virus has been detected in the U.S. for the last 25 years, but health officials say it's shown up earlier than usual in New Jersey this year, with the first two human cases reported in ...

How West Nile Virus Spreads WNV is spread to humans, birds, and other animals through the bite of an infected mosquito. Mosquitoes acquire WNV by feeding on infected birds.