New government estimates of the number of Americans who become infected with the AIDS virus each year are 50 percent higher than previously thought, sources said Friday. ...more

December 1, 2007

As many as one in three U.S. children have been ridiculed or threatened through computer messages, according to one estimate of the emerging problem of cyberbullying. ...more

November 28, 2007

not simply a lifestyle choice. ...more

November 15, 2007

More than 1 million cases of chlamydia were reported in the United States last year - the most ever reported for a sexually transmitted disease, federal health officials said Tuesday. ...more

November 14, 2007

The decades-long decline in smoking by Americans has stalled for three years, the first time smoking rates have leveled off for that long since the federal government began collecting statistics more than 40 years ago. ...more

November 9, 2007

The U.S. government does not conduct surprise inspections of laboratories handling the world's most dangerous organisms and poisons, but regulators said Thursday that they may change their tactics. ...more

October 5, 2007

Come one, come all: After years of shortages and confusion, this fall promises plenty of flu vaccine to go around - up to 132 million doses, more than the nation ever produced. ...more

September 20, 2007