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Dr. Martin Blaser, author of "Missing Microbes: How the Overuse of Antibiotics Is Fueling Our Modern Plagues," talks about his findings

More than 250 million antibiotic treatments are prescribed each year in the U.S., but a new book says the risk of taking too many pills goes beyond the threat of drug-resistant illnesses. Dr. Martin Blaser, author of "Missing Microbes: How the Overuse of Antibiotics Is Fueling Our Modern Plagues," talks to the "CBS This Morning" co-hosts about his findings.

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A new study suggests that taking high doses of vitamin C and E may make it harder for endurance athletes to train and more of today's top health stories

A new study suggests that taking high doses of vitamin C and E may make it harder for endurance athletes to train. Also, after years of decline, the number of children taking antibiotics is leveling off. New research suggests that shy children speak less because they are inhibited or reluctant to respond. Adriana Diaz has today's top health stories.

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