“…It has been shown in the U.S.A. (Beem, Wright, Hamre, Egerer, and Oehme, 1960;Chanock, Kim, Vargosko, Deleva, Johnson, Cumming, and Parrot, 1961;McClelland, Hilleman, Hamparian, Ketler, Reilly, Cornfeld, and Stokes, 1961) and in Great Britain (Sandiford and Spencer, 1962 ;Holzel, Parker, Patterson, White, Thompson, and Tobin, 1963) that respiratory syncytial virus is the predominant cause of bronchiolitis in infancy. Previous studies in Northern Ireland in 1962 and 1963 have also shown this association (Connolly, Forsyth, Haire, Evans, and White, 1963).…”