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Cold, Flu, & Cough Health Center

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Swine Flu Case Count Rising

7 Swine Flu Cases in San Diego, San Antonio; CDC Expects to Find More
WebMD Health News
Reviewed by Louise Chang, MD

April 21, 2009 - The CDC says seven people -- so far -- got sick from a new kind of swine flu virus.

More cases are likely to be found, says CDC respiratory disease chief Anne Schuchat, MD, as the CDC's intensive investigation gets more data on suspected cases.

Swine Flu Outbreak: Get the Facts

Swine Flu Slideshow

Learn more about the H1N1 swine flu and see what you can do to stay healthy.

View the slideshow.

"We believe that human-to-human spread is occurring. That is unusual," Schuchat said at a news conference. "We don't know yet how wide it is spreading. We have taken steps to learn more."

All seven of the people with confirmed swine flu recovered. Only one patient was ill enough to require hospitalization. The swine flu disease was similar to human flu, except that nausea and diarrhea were more common.

Patients ranged in age from 9 to 54 and included three girls and four males.

Five of the people who got the virus live in the San Diego area and two live near San Antonio. A father and daughter in San Diego and two 16-year-old boys from the same school in San Antonio are among the cases. But the three other cases are not connected.

The San Antonio cases have no connection to one infected San Diego boy who traveled to Dallas while ill. None of the seven cases appears to have had direct contact with pigs.

"We are seeing a virus that appears to be spreading from person to person in humans, and the viruses have very similar genetic characteristics to each other," CDC flu division chief Nancy Cox, PhD, said at a news conference.

It's a "very interesting" virus, Cox said. The viruses from San Diego and San Antonio are not exactly identical, but are both a type A H1N1 swine flu virus with unusual characteristics.

Genetic analysis shows that it contains gene segments from North American swine viruses, from North American bird flu viruses, from one human flu virus, and from swine flu viruses seen in Asia and Europe but not previously known in the U.S.

It's not yet clear whether the virus was detected along the Mexican border because of an intensive respiratory-disease surveillance program or because of any link to Mexico.

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