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Why Vaccines Matter
Senior Airman Katrina Alvarez prepares a vaccine for a basic cadet during in-processing June 27, 2013. Vaccines consist of dead or weakened forms of a virus that is injected into a patient to create a long-lasting immune response. Alvarez, now a staff sergeant, is a medical technician with the 10th Aeromedical Squadron. (U.S. Air Force photo/Liz Copan)

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