Chlamydia: A Silent Epidemic

(CBS) A new study has uncovered alarming information about the most common sexually transmitted disease in the United States that doctors are calling "the silent epidemic."There are 4 million new cases of chlamydia each year. Researchers reported in a recent issue of the Journal of the American Medical Association that, out of 300 sexually active girls between ages 12 to 19, more than one fourth tested positive for the disease.