MEDICAL ANIMATION TRANSCRIPT: Chlamydia is the most common bacterial sexually transmitted disease or infection worldwide. It's more common in women than men. The germs that cause the infection are tiny bacteria called Chlamydia trachomatis. You can catch Chlamydia from an infected person during vaginal, anal, or oral sex. And if a pregnant woman has Chlamydia, she can pass it to her baby as the baby moves through the birth canal during childbirth. In your body, the infection begins when the bacteria attached to cells in the tissue that lines many of your body cavities, called mucosal epithelium. Once attached, the bacteria begin to invade this tissue. Inside the cell, the bacteria start multiplying. When they escape to infect other cells, the bacteria may leave the cell they came from intact or the cell may be destroyed as the bacteria are released. The bacterial infection causes the body's own immune cells to enter the tissue. This inflames and damages the tissue as your immune cells ...