As I mentioned on July 14, the 18th is the American memorial day for Camillus de Lellis, the Roman Catholic patron saint of nurses, hospitals, and the sick. Are there patrons of health care workers among other denominations or tutelary dieties? I don't know.
Here are an image and a link that are not easily found through Google searches:
The Saint Benedict center has a long biography of Camillus. There isn't much information available on the epidemic in Rome of 1590, although one source in Google books identifies an influenza epidemic of 1590-1591.