Walter Reed hospital
Major Walter Reed, M.D., U.S. Army (September 13, 1851 – November 22, 1902), was a U.S. Army physician who in 1901 led the team that confirmed the theory of the Cuban doctor Carlos Finlay that yellow fever is transmitted by a particular mosquito species, rather than by direct contact.
https://en.wikipedia.org/wiki/Walter_Reed
Covid 19 is transmitted by … , rather than by direct contact.