Researchers, led by Dr Amber M Patterson of The Ohio State University/Nationwide Children’s Hospital, Columbus, Ohio, have found that influenza vaccines, both H1N1 and seasonal, can contain varying amounts of allergens such as egg and gelatin. This means that people who have been safely vaccinated in the past cannot be certain that they can be safely vaccinated again in the future.

The study was presented at the American College of Allergy, Asthma and Immunology annual meeting in Phoenix, Arizona; allergists suggest that people with allergy to egg or gelatin be tested to the specific vaccine lot number prior to immunization to avoid the possibility of any adverse reactions.

Source: Medical News Today

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