_:b56451692 . _:b56451690 _:b56451692 . _:b56451692 _:b56451693 . _:b56451690 _:b56451691 . _:b56451691 "C0021027" . _:b56451693 "titer antibody" . _:b56451690 . _:b56451691 "T116" . _:b56451693 . _:b56451690 . _:b56451691 "T129" . _:b56451690 . _:b56451690 "0.81"^^ .