The West Nile virus is back, and it's looking like it could be particularly bad this year. As as result, federal health officials are warning people to protect themselves against the mosquito-borne infection.
The West Nile virus first showed up in the U.S. in 1999 and quickly spread from coast to coast, raising widespread alarm. Some have argued that red-breasted robins play a key role in the spread of the virus.
