US government hits 20 cruiseships with lower marks on Covid-19 readiness 13 May 2021 Downgrades driven by Centers for Disease Control and Prevention’s shortened testing periodAuthor: Capt. Johnhttps://www.tradewindsnews.com/cruise-and-ferry/us-government-hits-20-cruiseships-with-lower-marks-on-covid-19-readiness/2-1-1010614