Swine flu cases up to 7; officials expand probe (Update)

(AP) -- Health officials are investigating a never-before-seen form of the flu that combines pig, bird and human viruses and which has infected seven people in California and Texas. All the victims recovered, but the cases are a growing medical mystery because it's unclear how they caught the virus.

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<p><a href="http://www.physorg.com/news159544017.html">Swine flu cases up to 7; officials expand probe (Update)</a></p> <p>(AP) -- Health officials are investigating a never-before-seen form of the flu that combines pig, bird and human viruses and which has infected seven people in California and Texas. All the victims recovered, but the cases are a growing medical mystery because it's unclear how they caught the virus.</p>