The second exception derives from studies in the early 1990s. LiPuma et al10,11 showed transmission among participants in a 4-week educational program in which young adults were together for seminar sessions, meals, recreational activities, a 7-h bus ride, twice-daily car rides of 45 min each, and long evenings in the same apartment. Govan et al12 showed transmission among a group of adults that included sexual partners, siblings, camp attendees, hospitalized patients kissing under the mistletoe, close friends with “protracted social contact,” and nine patients who regularly exercised together in a small space. Neither research group mentioned any effort to mitigate risk. These works are repeatedly cited as evidence of transmission by social contact.1,5,7-9 But, again, the conditions and behaviors they describe have no bearing on the CF Foundation ban.