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.
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
An epidemiologist from the World Health Organization said that the suspected hantavirus cluster aboard a cruise ship is not the beginning of another COVID-19 pandemic.