“…Outbreaks have been reported in different parts of this country by Hubble and Osborn (1941), Garrow and Fawcett (1953), Heycock and Noble (1956) and Disney, Sandiford, Cragg and Wolff (1960). These workers and others (Morrison, Bass, Davis, Hobson, Madsen and Masters, 1957;Holland, Tanner, Pereira and Taylor, 1960b;Gardner, Stanfield, Wright, Court and Green, 1960) have indicated that knowledge of the causes is still incomplete, especially in children less than 1 year old.…”