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Today's Top Medical Stories for Tuesday, September 3, 2013

Online peer pressure may encourage teenagers to engage in risky behavior and common infections can cost billions.

Infections that develop in patients at hospitals and other health care settings cost an estimated 9-point-8 billion dollars according to a new study. Researchers at Harvard Medical School say surgical site infections and pneumonia caused by ventilators are two of the most common and costly kinds of health-care associated infections.  Researchers say while steps have been taken to reduce the number of preventable infections, more needs to be done.

A new, 10-year study finds women in their 40 and 50s with asthma are hospitalized more than twice as often as men in the same age group. Researchers say until puberty, boys have higher rates of asthma than girls, but during the menopausal years, asthma becomes more of a women's health issue.

And a new report finds teenagers who see their friends smoking and drinking in photos on Facebook and other social networking sites -- are more likely to smoke and drink themselves. Researchers from the University of Southern California surveyed 15-hundred 10th graders in Los Angeles. They found more than a third of the students had at least one friend who talked about partying online. 20 percent reported that their friends posted pictures from parties and drinking photos on the web.

(Marlie Hall for CBS News)

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