Cruise ships hit by coronavirus outbreaks have quickly found themselves with no ports for thousands of passengers as countries on four continents have quarantined vessels or kept them at sea for days.

BEIJING (AP) — Officials in California were deciding Saturday where to dock a cruise ship with 21 coronavirus cases aboard and four U.S. universities canceled in-person classes as Western countries imitate China by imposing travel controls and shutting down public events to contain the outbreak.