Mycoplasma genitalium is a type of bacteria that can infect the genital tract in humans. It is one of the smallest known free-living organisms and lacks a cell wall, which makes it unique among bacteria. This organism is primarily transmitted through sexual contact and can lead to various health issues, including urethritis in men and cervicitis in women. Infections caused by Mycoplasma genitalium can often be asymptomatic, meaning many people may not show symptoms. However, when symptoms do occur, they can include pain during urination and unusual discharge. Diagnosis typically requires specific laboratory tests, and treatment usually involves antibiotics.