While managing the coronavirus outbreak on Diamond Princess in Asia, Carnival received more bad news: The virus had infected Grand Princess off the West Coast of the United States.

Grand Princess set sail on a round-trip itinerary to Mexico on Feb. 11 and to Hawaii on Feb. 21, with many of the same crew and 68 of the same passengers aboard both voyages. On March 4, California health officials reported the COVID-19-related death of a passenger from the former voyage. Princess confirmed an outbreak aboard the subsequent trip 48 hours later. The ship remained about 50 miles off the coast of San Francisco for three days, and disembarkation began in the port of Oakland on March 9.

Aly McDevitt is Data & Research Journalist at Compliance Week. She has a background in education and college consulting. Prior to teaching, she was an editor/author at Thomson Reuters, where she reported...