Oxytetracycline is especially valuable in treating nonspecific urethritis, Lyme disease, brucellosis, cholera, typhus, tularaemia.

A microorganism called chlamydia trachomatis is a major cause of the disease, nonspecific urethritis, which can cause pain during urination, swelling of the testes and even infertility.

When I was in the Navy during the Vietnam War, enlisted men (there were no women aboard ship then) got gonorrhea, but officers always got nonspecific urethritis, which didn't go on medical records.