Chlamydia trachomatous, T. mycoplasma, ureaplasma urealyticum, mycolasma hominis. An estimated quarter of cases are allergic reactions to latex or spermicide.
Similar to gonorrhea but usually milder. Urethral discharge is generally thin and clear. Planned Parenthood estimates that half of the women with one of these diseases doesn't know it. NSU/NGU in women can lead to pelvic inflammatory disease and sterility.
Penicillin is generally not effective against NGU/NSU- causing organisms. Tetracycilne is generally prescribed; sulfa drugs are effective against chlamydia but not the others.
In cases involving a pathogen, sexual intercourse, as well as hands with semen or vaginal secretions on them infecting the eye.