David Vetter was born without a functioning immune system and spent his life in a bubble that protected him from germs. He died at age 12 in 1984. Scientists are using gene therapy to treat the disorder so that children can live normally. Science Source hide caption

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Science Source

The genetic factors responsible for a cat's stripes might help researchers understand disease resistance in humans. kennymatic via Flickr hide caption

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kennymatic via Flickr

Could Genes For Stripes Help Kitty Fight Disease?

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Bacteroides species are some of the most common bacteria in the human gut. Enviornmental Health Perspectives hide caption

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Enviornmental Health Perspectives

Thriving Gut Bacteria Linked To Good Health

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Ayodhya Ouditt/NPR

Finally, A Map Of All The Microbes On Your Body

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Even in the remote Faroe Islands, some children have high levels of perfluorinated compounds in their blood. The chemicals may interfere with the immune system. Stig Nygaard/Flickr hide caption

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Stig Nygaard/Flickr

Common Chemicals Could Make Kids' Vaccines Less Effective

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Dr. Ralph Steinman of Rockefeller University died Friday, three days before he was named a winner of the Nobel Prize in Physiology or Medicine for "his discovery of the dendritic cell and its role in adaptive immunity."

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Mike Groll/AP