“…Taylor (1949) first isolated influenza virus C in 1947 from a patient suffering from a mild influenzal illness. The occurrence of this virus in human illness which has been recorded since then (Francis et al, 1950;Fukumi et al, 1951;Styk, 1954;Minuse et al, 1954;De Meio et al, 1955;Andrews and McDonald, 1955) has shown that it is usually associated with mild or trivial infections of the respiratory tract. A few authors have, however, described more severe illness.…”