Line graph showing rates of reported cases of chlamydia in the United States by sex from 2000 to 2018. In 2018, a total of 1,758,668 chlamydial infections were reported to CDC in 50 states and the District of Columbia. This case count corresponds to a rate of 539.9 cases per 100,000 population. In 2018, 1,145,063 cases of chlamydia were reported among females for a rate of 692.7 cases per 100,000 females. Among males, 610,447 cases of chlamydia were reported for a rate of 380.6 cases per 100,000 males.