Tests in birds, animals and mosquitoes have found the virus in 32 states, compared with 20 a year ago.

Studies show that the extrinsic incubation period in mosquitoes is about 10 days.

The researchers say that it may be possible to identify other odorant-specific receptors in mosquitoes.

Detection of developing resistance in mosquitoes is possible, so control programs are well advised to conduct surveillance for this potential problem.

The virus is usually found in mosquitoes that bite horses, not humans.

Then it sucks in mosquitoes which think they have just found a warm meal.

Typically, the virus doesn't show up in trapped mosquitoes until early fall.

In mosquitoes the emergence is in the evening or night.

Although the virus replicates in birds and mosquitoes, it does not make those hosts sick.

The bacteria that causes Lyme disease has been found in mosquitoes, he said.