_:b57006864 _:b57006865 . _:b57006862 _:b57006863 . _:b57006862 "0.84"^^ . _:b57006864 . _:b57006862 . _:b57006865 . _:b57006863 "C0019700" . _:b57006862 . _:b57006865 "seroprevalence" . _:b57006863 "T058" . _:b57006862 . _:b57006862 _:b57006864 .