A risk factor is something that increases your chances of getting a disease or condition.

Sexually transmitted chlamydial infections are transferred from one person to another by direct contact with an infected partner. Chlamydia is highly contagious and one of the most common sexually transmitted diseases (STDs).

Factors that increase your risk of getting chlamydia include:

  • Being sexually active and 15-25 years old
  • Having multiple sex partners
  • Having sex without a condom
  • A history of STDs

Neonatal chlamydia is transmitted during childbirth from an infected mother to her baby. It is a common cause of newborn conjunctivitis and chlamydial pneumonia. Most hospitals in the US are required to give eye drops to newborns to prevent conjunctivitis.