The Centers for Disease Control and Prevention (CDC) late on Thursday extended the No Sail Order for cruise ships, saying that there are at least 10 ships that have reported that crew members or passengers have COVID-19 or symptoms similar to those people who do have the disease. At least 20 additional ships at port in the U.S. have COVID-19 cases among crew members. The CDC had issued the first No Sail Order on March 14. This order will be in place for roughly three months. Year-to-date, shares of Carnival Corp. /zigman2/quotes/202325446/composite CCL +3.79% have tumbled 75.5%, Royal Caribbean Cruises Ltd.'s stock /zigman2/quotes/208854639/composite RCL +4.33% has dropped 69.8%, and shares of Norwegian Cruise Line Holdings Ltd. /zigman2/quotes/204183397/composite NCLH +6.39% is down 77.5%. The S&P 500 /zigman2/quotes/210599714/realtime SPX +0.51% has fallen 13.6% since the start of the year.