“…acute undifferentiated respiratory disease (Commission on Acute Respiratory Diseases, 1944Diseases, , 1947, influenza (Horsfall, 1952), the typhoid group (Banks, 1949), brucellosis (Spink, 1956), infective hepatitis (Hoagland and Shank, 1946), lymphocytic choriomeningitis (Adair et al, 1953), or any of the recently described benign meningitic or meningoencephalitic illnesses of viral origin (Acheson, 1954;Tyrrell and Snell, 1956;Lyle, 1956;Karzon et al, 1965;Garnett et al, 1957;Rotem, 1957).…”