Assertion: swine flu's case | /r/HasProperty | confirmed for example
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text: For example, when relatively few cases of human infection with this virus were lab confirmed and severity of the pandemic was not known, on April 28, 2009, CDC posted guidance for schools and advised that they close if they had a suspected or actual case of the flu in order to lessen the risk of spreading 2009 H1N1 into their communities.