_:b56964774 . _:b56964774 _:b56964776 . _:b56964777 . _:b56964774 "0.84"^^ . _:b56964774 . _:b56964774 . _:b56964777 "seroprevalence" . _:b56964774 _:b56964775 . _:b56964775 "C0019700" . _:b56964775 "T058" . _:b56964776 . _:b56964776 _:b56964777 .