The "Legion Fever" referred to with such dread is legionellosis or Legionnaire's Disease. The disease, caused by inhaling a water-borne bacteria in aerosol, had been first diagnosed the previous summer at a convention of the American Legion in July of 1976. This episode was first broadcast in February of 1977. However, three weeks before the broadcast the CDC announced that it had identified the causative organism behind legionellosis. See more
Other hotels have conventions, they get in plumbers, carpenters, you know what we get here? Forensic pathologists, they have a whole name, you know what that is? Coroners. Coroners, the guys in movies that go 'hmmm, guy's hanging by his neck, has a bullet hole in him, and an ice pick in his ear, I suspect it's foul play'.