Re the guy on Buquebus. I checked the Uruguayan paper, el Observador, and the story differs.
An Argentinian guy returned from London to Montevideo, and went for a few days to Punta del Este to visit some friends. He had himself privately tested for coronavirus, but the group decided to go back to BA before getting the result. He had no symptoms of illness, but while on Buquebus, he got an e-mail confirming that he was infected. He told his friends, who informed the captain, and it all evolved from there.
Quite a different story from "escaping from a hospital". Which one is true?