The new formulation is known as B.O.P.V., or bivalent oral polio vaccine.

VOA: special.2010.01.18

Listen again next week for another American story in V.O.A.Special English.

VOA: special.2010.02.27

"His name is John Barovetto, B-a-r-o-v-e-t-t-o.

VOA: standard.2010.05.31