<http://ns.inria.fr/covid19/PMC4121887#body_text> <http://purl.org/dc/terms/subject> "Cryogenian first appearances" . <http://ns.inria.fr/covid19/PMC4121887#body_text> <http://purl.org/dc/terms/subject> "Smallpox vaccines" . <http://ns.inria.fr/covid19/PMC4121887#body_text> <http://purl.org/dc/terms/subject> "Tick-borne diseases" .