Costa Smeralda - delayed in Civitavecchia (Rome) for coronavirus testing.  A passenger was diagnosed with the flu, not COVID-19 Westerdam - Denied docking in five ports before finally being allowed to dock in Cambodia.  All guests and crew members have been reported clear of COVID-19 Diamond Princess - one of the largest clusters of infection, held in Yokohoma, Japan. World Dream - put in quarantine in Hong Kong after three passenger from a previous cruise were later found positiv