A student gets vaccinated against pertussis at a Los Angeles middle school in 2012. The state required that students be immunized to halt an epidemic of whooping cough. Kevork Djansezian/Getty Images hide caption

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Kevork Djansezian/Getty Images

The Eagle Mountain Church in Newark, Texas, was linked to at least 21 cases of measles this year, mostly in children. LM Otero/AP hide caption

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LM Otero/AP

A red blood cell infected with malaria parasites (blue) sits next to normal cells (red). NIAID/Flickr.com hide caption

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NIAID/Flickr.com

Experimental Malaria Vaccine Shows Promise In Human Test

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Ads often tout dietary supplements and vitamins as "natural" remedies. But studies show megadoses of some vitamins can actually boost the risk of heart disease and cancer, warns Dr. Paul Offit. iStockphoto.com hide caption

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iStockphoto.com

Luke Tanner, 7, gets vaccinated for measles at a clinic near Swansea, Wales, in April. Wales is at the center of a measles outbreak that has been linked to one death. Geoff Caddick/AFP/Getty Images hide caption

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Geoff Caddick/AFP/Getty Images

A new study from the Centers for Disease Control and Prevention finds no link between the number of vaccinations a young child receives and the risk of developing autism spectrum disorders. Jeff J. Mitchell/Getty Images hide caption

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Jeff J. Mitchell/Getty Images

Number Of Early Childhood Vaccines Not Linked To Autism

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A simple switch of ingredients made a big difference in how mice responded to experimental cancer vaccines. Andrei Tchernov/iStockphoto.com hide caption

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Andrei Tchernov/iStockphoto.com

Nurse Christel Petersen inoculates a child in the South African Tuberculosis Vaccine Initiative study in 2011. Rodger Bosch/AFP/Getty Images hide caption

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Rodger Bosch/AFP/Getty Images

The fall armyworm, a corn pest, is now also a vaccine factory. Wikimedia Commons hide caption

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Wikimedia Commons

When flu viruses (in red) accumulate an escape protein too quickly, they exit the cell nucleus (in blue) before they've made enough viral copies to spread the infection. Benjamin tenOever hide caption

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Benjamin tenOever

Some parents have worried that kids get too many vaccinations too quickly. A review of all the available research suggests those concerns are misplaced. Dmitry Naumov/iStockphoto.com hide caption

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Dmitry Naumov/iStockphoto.com

Schedule Of Childhood Vaccines Declared Safe

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Dr. Tom Nary is the director of health services at Boston College. Tovia Smith/NPR hide caption

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Tovia Smith/NPR

Colleges Try To Curtail Flu Risk For Students

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A boy in Lima, Peru, receives a hepatitis B vaccine during an immunization drive in 2008. The United Nations is considering a ban on the preservative thimerosal, which is often used in hepatitis B and other vaccines in developing countries. Martin Mejia/AP hide caption

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Martin Mejia/AP

Doctors Argue Against Proposed Ban On Vaccine Preservative

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