The Old World hookworm is an intestinal parasite. The image above was taken by a scanning electron micrograph and was color-enhanced. The worm's actual size ranges from 0.03 inches to 0.3 inches. David Scharf/Science Source hide caption

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David Scharf/Science Source

Could Worms In Your Gut Cure Your Allergies?

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Fetal Cells May Protect Mom From Disease Long After The Baby's Born

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Psyched that it's finally spring? Shifts in the season may affect more than your mood. Corbis hide caption

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Corbis

Seasons May Tweak Genes That Trigger Some Chronic Diseases

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In some human diseases, the wrong mix of bacteria seems to be the trouble. Getty Images hide caption

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Getty Images

Mix Of Gut Microbes May Play Role In Crohn's Disease

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Streptococcus pyogenes shouldn't be taken lightly. Left untreated, an infection with germ can trigger an autoimmune disease that damages the heart. NIAID/Flickr.com hide caption

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NIAID/Flickr.com