Pelvic inflammatory disease epidemiology and demographics

Overview
In the United States, more than one million women are affected by PID each year, and the rate is highest with teenagers. Approximately 50,000 women become infertile in the US each year from PID [1]. N. gonorrhoea is isolated in only 40-60% of women with acute salpingitis. C. trachomatis was estimated by current obgyn 9th ed to be the cause in about 60% of cases of salpingitis, which may lead to PID. It is unsure how much is due to a single organism and how much is due to multiple organisms; many other pathogens that are in normal vaginal flora become involved in PID. 10% of women in one study had asymptomatic Chlamydia trachomatis infection and 65% had asymptomatic infection with Neisseria gonorrhoeae  It was noted in one study that 10-40% of untreated women with N. gonorrhoea develop PID and 20-40% of women infected with C. trachomitis developed PID. . PID is the leading cause of infertility. "A single episode of PID results in infertility in 13% of women." This rate of infertility increases with each infection.