Bacterial vaginosis occurs when lactobacillus in the vagina is replaced by other bacteria. It is the most common cause of vaginitis, accounting for 40-45 percent of cases and usually causes a ‘fishy’ thin off-white vaginal discharge, which is more noticeable after unprotected sex.
Although the majority of affected women are sexually active, bacterial vaginosis can occur in women who have never had sex. Other predisposing factors for bacterial vaginosis include oral sex, intrauterine contraceptive devices, vaginal douching and pregnancy.
50 percent of bacterial vaginosis cases do not cause any symptoms and do not need treatment, unless the woman is undergoing gynaecological surgery or is pregnant and has previous preterm birth. Testing and treatment of male sexual partners is not needed and unhelpful in preventing repeat infection.
Treatment of bacterial vaginosis consists of a course of antibiotics and avoiding vaginal irritants. Recommended antibiotics are metronidazole (flagyl) or clindamycin given through either the oral or vaginal route. Avoid using alcohol during treatment with oral metronidazole and for 24 hours thereafter. Metronidazole pills also interact with warfarin.
50 percent of affected women have a repeat episode of bacterial vaginosis within one year. In women who have frequent episodes of bacterial vaginosis, these treatment strategies may be helpful:
Candidiasis occurs when there is an overgrowth of the yeast organism called candida, which is usually found in small numbers in the normal vaginal environment. It is the second most common cause of vaginitis, accounting for 20-25% of cases.
It usually causes a thick white odourless discharge. Vaginal itch and soreness are also prominent symptoms. Predisposing factors for candidiasis include pregnancy, diabetes and medical conditions which cause low immunity, antibiotics and birth control pills.
20 percent of candidiasis cases do not cause any symptoms and do not need treatment. Testing and treatment of sexual partners is not needed because candidiasis is not considered sexually transmitted.
Treatment of candidiasis consists of a course of antifungal medications given by the oral or vaginal route. Vaginal antifungal medications may weaken latex condoms so additional contraception is needed when the woman is using antifungals. 5 percent of women have recurrent candidiasis (four or more repeat episodes of candidiasis in one year) and may benefit from the following strategies:
Trichomonas is a sexuallytransmitted parasite with a high transmission rate of at least 70 percent after just one exposure to an infected partner. It is the third most common cause of vaginitis, accounting for 15-20 percent of cases.
50-75 percent of infected persons have no symptoms. Common symptoms include foul-smelling yellow-green vaginal discharge and vaginal itch.
It is important to treat all cases of
trichomonas infection, even if there
are no symptoms. Trichomonas
infection can spread from the vagina
to the upper genital tract (i.e. the
womb, tubes, ovaries), causing
damage which can affect fertility and
increase the risk of ectopic pregnancy.
Untreated trichomonas infection in
pregnancy is associated with a high
risk (30 percent) of preterm birth.
Testing and treatment of sexual
partners is mandatory. Treatment
consists of a course of oral antibiotics
(metronidazole or tinidazole).
Atrophic vaginitis refers to a type
of vaginitis that occurs because of
oestrogen deficiency, usually after
menopause. It occurs in up to 40
percent of postmenopausal women.
Oestrogen stimulates the growth
of lactobacilli in the vagina. Lack of
oestrogen causes thinning of the
vaginal skin and increases the pH
of the vaginal environment. This
predisposes the genital area to
Because the problem is mainly due
to lack of oestrogen, treatment of
atrophic vaginitis usually depends on
replacing oestrogen in the tissues.
Usually a cream, pessary or vaginal
tablet or ring containing oestrogen is
prescribed to replace oestrogen levels
in the genital area. If there are other
menopausal symptoms that require
treatment, oestrogen is delivered in
a more generalised form via an oral
tablet or skin patch.
Vaginal moisturisers and lubricants
may also be given but these are
usually not as effective as oestrogen.
Antibiotics are not needed in the
treatment of atrophic vaginitis.
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