How many large medical ships medical carriers does the US have?

Only two, one for marcy and one for comfort, and the two medical ships are only capable of accomplishing trauma and non-communicable disease treatment. As for why they can't treat infectious diseases, take Thor's Mountain Vulcan as an example, Vulcan and Thor's Mountain are negative pressure wards, where the air in the wards is constantly pumped out through filtration devices to prevent aerosol cross infection. And the military hospital ship was mainly geared towards trauma. The grade difference is too far. The U.S. hospital ship, equivalent to the Diamond Princess plus surgical equipment. The only existing hospital ship for China's Peace Ark gangway number 866, a total of three hundred beds, with a real sense of isolation beds.