<http://ns.inria.fr/covid19/PMC7110841#body_text>	<http://purl.org/dc/terms/subject>	"1969 establishments in California" .
<http://ns.inria.fr/covid19/PMC7110841#body_text>	<http://purl.org/dc/terms/subject>	"Feces" .
<http://ns.inria.fr/covid19/PMC7110841#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .