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.
Since November 2024, there have been 11 cases of this more severe strain across the country.
Nipah, a zoonotic virus spread by fruit bats, pigs and human contact, has a fatality rate of 40% to 75%, according to the WHO.
Officials are investigating after a 60-year-old woman from Long Island said she tested positive for the virus in a preliminary test.
Health officials are warning travelers about an outbreak in southern China of a painful mosquito-borne virus called chikungunya, which is spread by infected mosquitoes, mainly Aedes aegypti.
A norovirus outbreak aboard a luxury cruise ship has left over 224 passengers and 17 crew members ill, according to the CDC.