Seven people have been diagnosed with a new kind of swine flu in California and Texas, the U.S. Centers for Disease Control and Prevention reported on Thursday.
All seven people have recovered but the virus itself is a never-before-seen mixture of viruses typical among pigs, birds and humans, the CDC said.
"We are likely to find more cases," the CDC's Dr. Anne Schuchat told a telephone briefing. "We don't think this is time for major concern around the country."
Only one of the seven cases was sick enough to be hospitalized and all have recovered, Schuchat said.
CDC officials are unsure whether the cases are related to an unusually late and severe flu season in Mexico in which 20 people have died.
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