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Hi Dr. Ashori here.
Have your tried having your partner treated as well?
The probiotics and Vit C is a great idea.
I would keep up with that.
Also, avoiding any soaps or strong chemical washes, specifically antibacterial soaps, will help decrease the chance of you getting such infection with BV.
If you are using a personal lube, or condom or other product it would be advisable to change that around.
If your partner is using any chemicals on their body then those too can interfere with your vaginal flora and cause the infection.
He can't be tested, there is no test for men.
But we do treat our partners if the BV is recurrent.