Polio contracted: 1922, 1936, 1937 (2), 1947 (2), 1948 (7), 1949 (8), 1950 (13), 1951 (19), 1952 (6), 1953 (7), 1954 (4), 1955, 1956, 1957 (2), 1959 (2), 1960