Public schools in the United States are making “little progress” in expanding instruction in how to prevent pregnancy and sexually transmitted diseases such as HIV, a new federal study concluded, Reuters reports. Between 2008 and 2010, the percentage of public schools teaching key topics on prevention did not increase in the 45 states surveyed, the Centers for Disease Control and Prevention said. In middle schools, 11 states saw declines during the two-year period and no state saw an increase, the CDC said. The level of instruction was stable in high schools…

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