Tiger mosquitoes are developing resistance to a common insecticide used in mosquito control programs, NC researchers say.
The Ruby Princess cruise ship was docked for disinfection at San Francisco's Pier 27 Thursday morning after a norovirus outbreak affected dozens of passengers and crew.
A flight carrying U.S. citizens who were on the ship arrived Monday in Nebraska.
The outbreak was reported to the CDC on Thursday, during the cruise ship's April 28 to May 11 voyage.
Six U.S. states are tracking nine residents for possible hantavirus infections.
Spanish authorities on Friday were preparing to receive more than 140 passengers and crew members on board a hantavirus-stricken cruise ship headed for the Canary Islands.