 [ Symptoms ] if you have the herpes simplex 1 virus in you is your saliva always infected with it  asking so if you kiss someone are you possibly giving them herpes without an outbreak [ Disease ] bacterial vaginosis is caused by an imbalance of the organisms flora that naturally exist in the vagina normally about 95 of vaginal flora are lactobacillus bacteria these types are unique to humans different from the lactobacillus in yogurt  these lactobacilli help keep the vaginal ph level low and prevent overgrowth of other types of organisms women with bacterial vaginosis have fewer lactobacillus organisms than normal and more of other types of bacteria experts do not yet understand what causes this imbalance 1 although the specific cause is not known a number of health and lifestyle factors have been linked to bacterial vaginosis for more information see the what increases your risk section of this topic webmd medical reference from healthwise this information is not intended to replace the advice of a doctor healthwise disclaims any liability for the decisions you make based on this information © 1995 2011 healthwise incorporated healthwise healthwise for every health decision and the healthwise logo are trademarks of healthwise incorporated