Researchers at the National Museum of Natural History discovered that a kind of bird-biting mosquito has crossbred with one that prefers humans, a development that might have aided the rapid spread of the West Nile virus across the United States.
Researchers at the National Museum of Natural History discovered that a kind of bird-biting mosquito has crossbred with one that prefers humans, a development that might have aided the rapid spread of the West Nile virus across the United States.