Trichomonal vaginitis is a venereal infection caused by parasites called trichomonas. Symptoms include persistent burning and itching of the vulva area accompanied by a frothy white or yellow discharge. This infection has no major effects on a pregnancy.
Treatment of trichomonal vaginitis is a concern during pregnancy. Metronidazole, the drug used to treat trichomonal vaginitis, should not be taken during the first trimester of pregnancy. It is prescribed after the first trimester.