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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Does a little sugar water before shots really help ease a babies' pain? If only they could tell us. Dmitry Naumov/iStockphoto.com hide caption

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Dmitry Naumov/iStockphoto.com

At a Los Angeles media briefing in 2010, Mariah Bianchi describes how her own case of whooping cough caused the death of her newborn son. Reed Saxon/AP hide caption

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Reed Saxon/AP

A mother dresses her baby after doctors examined him during the malaria vaccine trial at the Walter Reed Project Research Center in Kombewa in Western Kenya in October 2009. Karel Prinsloo/AP hide caption

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Karel Prinsloo/AP

Experimental Malaria Vaccine Disappoints, But Work Continues

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Two boys study together at a Chicago yeshiva in 2009. Public health officials say this type of close physical contact caused a mumps outbreak to spread throughout several orthodox Jewish communities in and around New York City. M. Spencer Green/AP hide caption

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M. Spencer Green/AP

Health workers transport the polio vaccine by donkey in southeastern Pakistan. Asad Zaidi/Courtesy of UNICEF Pakistan. hide caption

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Asad Zaidi/Courtesy of UNICEF Pakistan.