[Kobyashi1942]

Did west nile virus get here because we stupidly imported people or animals from Africa who had this virus?

[realpatriot71]

Did west nile virus get here because we stupidly imported people or animals from Africa who had this virus?

There's a slight chance an infected bird caught a ride from Africa to the US, but the most likely explanation is that a, infected mosquito laid egg on a ship in northern africa, and those eggs made the trip to the US, whence they got wet and hatched somewhere along the way.