Legionnaires was named because of the 1976 American Legion convention in Philly, where there were so many who fell ill. I will agree that it may have been looked into before that. You are probably privy to info I’m not aware of, so I will defer to you. I was just coming of age then, and I remember hearing about Legionnaires at that time.
Yes, the outbreak during the convention and the Pennhurst reporting are two distinct events. Shouldn’t have mixed it into the convo.