I have symptoms of bacterial Vaginosis ( fishy odor , white coating on vaginal walls , sometimes itch and irritation , but the itch and irritation are rare . ) . I ve tested negative for all std s ( except I ve had HPV for 20 years . The HPV isn t causing outbreaks at the moment ). My vaginal cultures were all negative too . This has been going on for over a year . My natural vaginal odor is quite pleasant to me . Smells almost like nothing . Then this fishy odor comes along and I test negative for BV and other things . Last year I tested positive in November . I took flagyl 2-3 times since then and the odor came back the day after the last dose each time . Are there any infections that can hide in the body and cause fishy odor besides trich and BV ? BTW, My boyfriend was treated with flagyl each time I was . Could it be a BV biofilm ? Could I have a biofilm and still have a negative culture ? How can I get rid of biofilm ? Is there a DNase gel I could get ? Thanks so much !