Hello, bacterial vaginitis is a common cause of vaginal infection for women of childbearing age. It frequently appears after sexual intercourse with the new partner but it is not sexually transmitted infection. It is common in women with multiple partners. It is caused by an imbalance of naturally occurring bacterial flora and smoking and use of some hygiene products are likely to develop BV. Sometimes it is asymptomatic .It may appear and disappear for no reason. In about 90 % of cases responds to antibiotics but another 25% develop BV in 3-4 weeks time. Patients with these symptoms present with vaginal discharge that could be watery or thin, becomes grey or white will have a string unpleasant smell, burning micturition and itching around the vagina. The vagina contains lactic acid bacilli, which prevents the growth of other bacteria. Certain activities can upset the balance of the naturally occurring bacterial flora and increase the risk of developing BV such as douching, having bath with antiseptic liquids, multiple sex partners, using scented soaps .It can be best diagnosed with a vaginal swab. BV can sometimes clear by it self, or the use of probiotics might help to avoid complications. Metronidazole is common antibiotic used. It is used twice a day after food. Metronidazole can react with alcohol so it is best not to consume alcohol with the medication. Alternatively you can use clindamycin either in the form of cream applying once a day for seven days or in a capsule forms twice a day for seven days. It is also ideal to treat your partner too. In regard to your question, you may have had a recurrence of the infection following the treatment .I would suggest you to consult your obg – gyn doctor for the management. Thank you.