Once very common, reported cases of chancroid have fallen to fewer than 1,500 per year in the United States. This may be due to increased condom use among American men. Untreated chancroid can infect and swell the glands located in the groin. These swollen sores are called buboes. Men are more commonly infected than women.
Symptoms usually appear within a week of infection.
Chlamydia Chlamydia is a very common and invisible sexually transmitted infection that can cause sterility in women and men. Reiter's syndrome involves eye infections, urethritis and arthritis. In infants, chlamydia can cause pneumonia, eye infections and blindness. Seventy-five percent of women and 25 percent of men with chlamydia have no symptoms. Many women discover they have chlamydia only because their partners are found to be infected.