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.
California health officials on Monday released new information about four residents who were exposed to the hantavirus and are now being monitored, all of whom are currently healthy and not showing symptoms.
As the number of norovirus cases rise and hantavirus lingers on cruise ships, health officials advise passengers to take precautionary measures to avoid sickness.
A Santa Clara County resident was one of two Californians aboard the cruise ship with the Andes hantavirus outbreak. The county is monitoring and evaluating the person in coordination with the California Department of Public Health and the CDC.
The outbreak was reported to the CDC on Thursday, during the cruise ship's April 28 to May 11 voyage.
More than two dozen people from at least 12 different countries left a cruise ship hit by a deadly hantavirus outbreak without contact tracing, officials say