Show national polio Rati Rateb lowest west in four years the U US S public health service offered encouraging statistics last week the national polio rate was the lowest since 1951 up to oct 21 there had been 25 cases of acute polio with a total of 29 expected for the entire year this compared with 28 in 1931 1951 and 38 33 last year the death rate for infantile paralysis the health ser vice pointed out had dropped sharp ly from to deaths are ex pecked or less than half the 1954 rate officials indicated that use of the salk vaccine was a contri buting factor |