“…A number of investigations have shown that the predominant immunoglobulin in adult nasal secretions is IgA (Remington, Vosti, Lietze & Zimmerman, 1964;Rossen, Schade, Butler & Kasel, 1966). Moreover, antibody activity in adult nasal secretions, following various rhinovirus, influenza and parainfluenza infections, has been predominantly in the IgA fraction (Cate et al 1966;Alford et al 1967;Smith, Bellanti & Chanock, 1967;Perkins et al 1969). There have been few parallel studies for the immunoglobulins of nasal secretions of infants and young children (Haworth & Dilling, 1966;Cohen, Goldberg & London, 1970).…”