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(14) New York Neurologic Society, Collective Investigation Committee: Epidemic poliomyelitis report on the New York epidemic of 1907. J. Nerv. & Ment. Dis. Monograph series No. 6. 1910.

(15) McClanahan, H. M.: A brief report of the Nebraska epidemic of poliomyelitis. J. A. M. A. 55: 1160-1162 (1910).

(16) Dauer, C. C.: Studies on the epidemiology of poliomyelitis. Pub. Health Rep. 53 1003-1020 (1938); 54: 857-862 (1939); 55: 955-961 (1940); 56: 875-883 (1941); 57: 710-716 (1942); 58: 937-949 (1943); 59: 712-719 (1944); 60: 633-642 (1945); 61: 915-921 (1946); 62: 901-909 (1947); 63: 393-396 (1948); 64: 733–740 (1949); 65: 782-787 (1950); 66: 673–684 (1951); 67: 524–526 (1952).

TYPE I POLIOMYELITIS VIRUS ADAPTED TO MICE

Successful adaptation of type I (Mahoney) poliomyelitis virus to Swiss mice has been achieved by Drs. C. P. Li and Morris Schaeffer, of the Public Health Service Communicable Disease Center. Their report appears in the March 1953 issue of the Proceedings of the Society of Experimental Biology and Medicine, pages 477-481.

The authors conclude that: "The use of the intraspinal route of inoculation and the selection of a mutant or variant of the virus is believed to be responsible for this adaptation. *** With this attainment, all three poliomyelitis virus types have now been adapted to mice. This will permit for rapid progress in field and laboratory studies of poliomyelitis." The findings are important to poliomyelitis diagnosis and to the development of a live virus vaccine.

Deaths from acute poliomyelitis: death registration States,' 1920-52

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1 For death registration States which increased in number from 34 States and the District of Columbia in 1920 to the entire continental United States in 1933.

* Estimated from a 10-percent sample of deaths.

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REPORTABLE DISEASES

TABLE 15.-Reported cases of acute poliomyelitis: United States, each division and State, 1920-50

West North Central.

Nebraska.

Kansas.

South Atlantic.

Delaware.

Maryland.

District of Columbia.

East South Central.

Kentucky.

Tennessee.
Alabama.
Mississippi.

1 Estimated.

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TABLE 15.-Reported cases of acute poliomyelitis: United States, each division and State, 1920-50-Continued

Michigan..
Wisconsin...

1 Estimated.

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TABLE 15.-Reported cases of acute poliomyelitis: United States, each division and State, 1920-50-Continued

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