_:b57526061 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b57526060 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/4f3c437b1e6e619ef6c9053904520290200e9bc4/5> . _:b57526061 <http://www.w3.org/ns/oa#exact> "virus titer" . _:b57526060 <http://www.w3.org/ns/oa#hasSelector> _:b57526061 .