Assertion: swine flu's case | /r/RelatedTo | close contact
Facets:
value: with infected pigs
type: OTHER
value: most often
type: DEGREE
Source sentences:
text: The cases of 2009 H1N1 flu in California occurred in the context of sporadic reports of human infection with North American-lineage swine influenza viruses in the United States, most often associated with close contact with infected pigs.