<http://ns.inria.fr/covid19/PMC6887893#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC6887893#body_text>	<http://purl.org/dc/terms/subject>	"Bacterial toxins" .
<http://ns.inria.fr/covid19/PMC6887893#body_text>	<http://purl.org/dc/terms/subject>	"2014 mergers and acquisitions" .