<http://ns.inria.fr/covid19/PMC7110785#body_text>	<http://purl.org/dc/terms/subject>	"1972 deaths" .
<http://ns.inria.fr/covid19/PMC7110785#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC7110785#body_text>	<http://purl.org/dc/terms/subject>	"Infant feeding" .