Something is a little fishy and it isn't the U.S.S. Comfort

The hospitals in New York are overrun with Covid-19 cases, so the Navy sent a ship to New York City, population 8.6 million to deal with all the non-Covid-19 cases... It is treating 20 patients. The mayor says everyone sick in New York has Covid-19 and that is why the ship doesn't have any patients... but there are 8.6 million people in the city. How can only 20 of them not have Covid-19... Prior to this article, everyone checking into the hospitals was apparently begin given a rapid test and only 20 of them did not have it and so they were able to go to the ship. Now, (probably because there is research showing that if you don't have symptoms you cannot spread it), the ship will just be taking people's temperatures to get them on board. Still only 20 sick people in all of New York don't have this disease right now... I smell a rat somewhere, but I don't think it's on the U.S.S. Comfort because it probably has Covid-19.