Researchers say they are keeping an eye out for any negative reactions to the shot.
"Occasionally, people may say that flu shot gave me the flu. They may feel like they have the flu because some people do develop a fever and feel under the weather after they received a killed vaccine," said Dr. Wendy Keitel, Director of the Baylor Swine Flu Vaccine Study. "It is not influenza. It is a reaction to the vaccine."
So far, the most common side effects of the swine flu vaccine appear to be redness and soreness at the injection site.
There are eight sites in the country testing swine flu vaccines, including Baylor. It's estimated that swine flu could infect 100 million people in the U.S.
If you want to take part in the study, we've got a link to the information on how to get started here.
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