“…Infective materials agglutinate erythrocytes from various species of monkeys, such as baboon (95, 109), rhesus (27,109,110), cynomolgus (109), patas (95, 109), and African green monkey (109), but not erythrocytes of sheep, chicken, guinea pig, rabbit, horse, hamster, mouse, rat, cat, cattle, and man (109). The reaction was found to be speifically inhibited by measles antiserum (27,95,109,110). Measles hemagglutinin has been demonstrated in various cell culture systems, but no hemagglutinin was shown in chick fibroblast cultures, even though infective titers were as high as in the other systems which produced hemagglutinin (95,109).…”