A naturally occurring highly attenuated strain of type 1 poliomyelitis virus.
D011051:Poliomyelitis; D017955:Poliovirus
POLIOMYELITIS VIRUS
J Exp Med. 1954 Feb;99(2):167-82
13130792
J Am Med Assoc. 1956 Dec 29;162(18):1589-96
13376323