J&J's vaccine was just 57 percent effective in South Africa, while it was 72 percent effective in the US.
NgoMasingana i-J&J imemezele ukuthi ukusebenza komjovo wayo kufinyelele kumaphesenti angama-72 eMelika, Uma kuqhathaniswa namaphesenti angama-57 kuphela eNingizimu Afrika.