The U.S. health system is underperforming in delivering care that could prevent heart attacks, stroke, cancer and the spread of HIV, says the Centers for Disease Control and Prevention.

For example, only 47% of Americans diagnosed with ischemic cardiovascular disease were prescribed aspirin or another antiplatelet, according to federal survey data from 2005 to 2008 analyzed in a CDC report published as a special supplement to the June 15 Morbidity and Mortality and Weekly Report.

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