<http://ns.inria.fr/covid19/PMC5869499#title>	<http://purl.org/dc/terms/subject>	"Immune system" .
<http://ns.inria.fr/covid19/PMC5869499#title>	<http://purl.org/dc/terms/subject>	"Pork" .
<http://ns.inria.fr/covid19/PMC5869499#title>	<http://purl.org/dc/terms/subject>	"Mammals as pets" .