_:b56858446 . _:b56858449 "protective efficacy" . _:b56858446 . _:b56858446 _:b56858448 . _:b56858447 "C1707887" . _:b56858446 "0.81"^^ . _:b56858447 "T062" . _:b56858448 _:b56858449 . _:b56858449 . _:b56858448 . _:b56858446 _:b56858447 . _:b56858446 .