A rodent breeder in Wisconsin was found to be positive with a hantavirus as well as their close family member. In particular it was the Seoul virus which is not usually seen in the US and often associated with milder symptoms than hantavirus, but it can lead to renal disease. The initial cases of virus infection led to screening many other breeders in the area and six others were confirmed. This has led to health officals to implement routine screening in the area to try and catch any more cases of the virus. Also they have begun investigating and tracking where the virus may have originated from and become introduced into the Wisconsin population. Of course health officials are warning breeders to be cautious around rodents as they can carry many viruses and to wash hands frequently when working with them.