_:b57656525 <http://www.w3.org/1999/02/22-rdf-syntax-ns#type> <http://www.w3.org/ns/oa#TextQuoteSelector> . _:b57656525 <http://www.w3.org/ns/oa#exact> "virus titer" . _:b57656524 <http://www.w3.org/ns/oa#hasSelector> _:b57656525 . _:b57656524 <http://www.w3.org/ns/oa#hasSource> <http://ns.inria.fr/covid19/arg/06c16fa82eea996e285bd1611bc929d57dfb0a8f/2> .