Assertion: swine flu's case | /r/HasProperty | identified in april
Facets:
Source sentences:
text: Six days after the first case was identified in April 2009, the CDC began working to develop a candidate vaccine virus.
text: The first human case of H1N1 was identified in April 2009, and it quickly spread around the world.
text: Six days after the first case was identified in April 2009, the CDC began working to develop a candidate vaccine virus.