NGU, or non-gonococcal urethritis, is an infection of the urethra caused by Chlamydia that often develops after a Chlamydia infection. It was discovered in the 1800s that those infected with Chlamydia would later develop NGU. Symptoms in men include discharge from the penis and burning during urination, while women experience vaginal discharge and bleeding between periods. Antibiotics can cure NGU. Each year in the US there are an estimated 3 million Chlamydia cases, with 40-60% developing NGU without treatment. Long term consequences can include infertility or pregnancy complications.