Studies on variants of poliomyelitis virus. I. Experimental segregation and properties of avirulent variants of three immunologic types.
D000818:Animals; D007267:Injections; D008252:Macaca fascicularis; D051379:Mice; D011051:Poliomyelitis; D017955:Poliovirus; D014774:Virulence
POLIOMYELITIS VIRUS