Epidemic Poliomyelitis, Des Moines, Iowa, 1959

Epidemic of Type 3 Paralytic Poliomyelitis in Baltimore, Maryland, 1960

“…They did find the highest risk to be in preschool children, but this has also been true of the major type 1 urban epidemics which have occurred since mass immunization began (6)(7)(8)(9)(10)(11). The 1952 data of Shelokov and co-workers (12) 1941, 1944, 1950, and 1953. On the question of whether type 3 poliovirus produces more severe disease and higher incidence of bulbar involvement than other poliovirus types, the Baltimore epidemic offered these findings: The paralytic fatality ratio was similar to that of its acknowledgedly severe predecessor in 1944, and the percentages of both cranial nerve involvement and respiratory failure were higher than usually seen (18).…”