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Afghan mission broadens

WASHINGTON — U.S. troops in Afghanistan may once again engage Taliban fighters, not just al-Qaida terrorists, under new guidelines quietly approved by President Barack Obama, administration officials say.

Study ties dental drugs, heart infection risk

CHICAGO — Curbing the routine use of preventive antibiotics before dental work may have contributed to a rise in heart valve infections in England, a new study suggests. In the U.S., the highest risk patients still get these drugs and no similar trend has been seen.