CDC 's vaccine began with inoculating school children in April , 1955 . Polio was declared eradicated in the U.S. in 1979 , but still exists in other countries . A new microneedle patch is easily used by minimally trained personnel .
Salk 's vaccine began with inoculating school children in April , 1955 . Polio was declared eradicated in the U.S. in 1979 , but still exists in other countries . A new microneedle patch is easily used by minimally trained personnel .