<http://ns.inria.fr/covid19/PMC4900951#body_text>	<http://purl.org/dc/terms/subject>	"Smallpox vaccines" .
<http://ns.inria.fr/covid19/PMC4900951#body_text>	<http://purl.org/dc/terms/subject>	"Primates of Africa" .
<http://ns.inria.fr/covid19/PMC4900951#body_text>	<http://purl.org/dc/terms/subject>	"Arabian Peninsula" .
<http://ns.inria.fr/covid19/PMC4900951#body_text>	<http://purl.org/dc/terms/subject>	"Immune system" .