Polio vaccine attenuated vaccine strains. In 1958, the National Institutes of Health created a special committee on live polio vaccines. The various vaccines were carefully evaluated for their ability to induce immunity to polio, while retaining a low incidence of neuropathogenicity in monkeys. Large-scale clinical trials performed in the Soviet Union in late 1950s to early 1960s by Mikhail Chumakov and his colleagues demonstrated safety and high efficacy of the vaccine. Based on these results, the Sabin strains were chosen for worldwide distribution. Fifty-seven nucleotide substitutions distinguish the attenuated Sabin 1 strain from its virulent parent (the Mahoney serotype), two nucleotide substitutions
How the Riddler Got His Name (Paul Pilcz) and his men until Selina arrives. She claims she didn't send him the note and leaves. Sonny and his men start beating him but Bruce finally regains strength and beats them. Before returning to Wayne Manor, he is found by Five, who drugs him and claims that he is made to be him. Five then arrives at Wayne Manor and begins posing as Bruce. Bullock leaves to attend a police academy graduation. Nygma is again confronted by Cobblepot, who just wants him to admit he's lost without him. Nygma refuses and then, in an hallucination, Cobblepot (using the