Show strict tests through every process i assure safety of salk polio vaccine for the drat first time in history hl atory a vaccine Is I 1 protecting millions of human heina from paralytic polio while the salk vaccine i will not work in every case j J american children ore are heing liln t alt safeguarded against the dread 30 disease with no more rik risk than I 1 they would take in a vaccination F lf against or a typhoid j hol shot ilic the sulk salk incline must pass 7 clah oralle teats tests under ilse watchful cc ee of a government hippee inetor v at cery tage stage of production 4 then rhen the final packaged va is i approved hy tile US cuhlic health f r here are shown a few of the steps 11 nn AD p hat that assure american parents their children are being heing given a this technician Is filtering dead cells and all virus Is cooked in tank with formaldehyde other matter from polio virus after it from bottle until it Is hindered rin dered harmless ate safe vaccine has grown on in glass con after which it must pass exacting safety j e IN YX ak to ak 44 0 all atit animal tissue in tubes Is inoculated with vac this expert Is I 1 examining tissue its it all over and it hurt a beitl salk vaccine cine and let stand if any live virus remains after contact with to makes this little girl safer now from paralytic it will multiply here hence can be detected determine absence of live virus polio and her parent parents feel better tool |