A Cleveland Clinic study showed a higher risk for the flu among vaccinated participants. It didn’t measure how the vaccine reduced risk for severe illness.

The study, which was released April 4 on the preprint server medRxiv and hasn't been published in a peer-reviewed journal, aimed to test the flu vaccine's effectiveness in about 53,000 Cleveland ...

About 4% of flu doses here are packaged in multi-dose vials, which contain thimerosal to lower the risk that a vial might become contaminated in the process of withdrawing successive doses.

Six members of the committee voted to continue to recommend that everyone 6 months and older receive an annual flu vaccine. Pebsworth abstained. Vaccines with thimerosal are still approved by the FDA.

Swine flu vaccines are due to start arriving in the United States next week with high-risk patients first in line, according to Dr. Richard Besser, ABC News' senior health and medical editor.

Vaccines for livestock could reduce the risk of human outbreaks, but hurdles remain. Will bird flu spark a human pandemic? Scientists say the risk is rising Early findings, posted this month 1 on ...