The deadly H1N1 swine flu virus has been confirmed in the Chicago area.

A microbiologist told CBS Chicago that in the last week they’ve found 21 patients with Influenza A and all but one of those cases was H1N1.

“We don’t know why it’s emerging,” Dr. Paul Schreckenberger said.

The outbreak in Chicago is troubling because five people have been confirmed dead in Texas from an outbreak of H1N1.

All five people have been confirmed to have died from H1N1. The Centers for Disease Control says that the flu shot for this year can help protect against H1N1 but less than half of American adults get a flu shot.

The CDC also says that 80 percent of the flu infections in Texas are H1N1.