Home HealthTopics Health Centers Reference Library Research
Join us on Facebook Join us on Facebook Share on Facebook

Children's Health

Vaccine efficacy

06/29/2009

Question:

Does the minimal bleeding that is observed right after an IM injection of a vaccine affect its efficacy?

Answer:

Thank you for your question about vaccines and how effective they are.  Vaccines are injected either below the skin or in the muscles.  Either way they are injected can cause bleeding from the skin and would not cause issues with how effective the vaccine would be.  Please be assured that the vaccine is still effective if there is bleeding or even a small amount fluid at the site.

For more information:

Go to the Children's Health health topic, where you can:

Response by:

Allison A Macerollo, MD Allison A Macerollo, MD
Clinical Assistant Professor of Family Medicine
College of Medicine
The Ohio State University