 [ Symptoms ] can a man contract trichomoniasis from having unprotected sex with a partner with a bacteria andor yeast infection [ Disease ] you are talking about three different types of vaginal pathogens trichomoniasis is a parasite it is not uncommon for a woman to have all three and be misdiagnosed as only having one or two of the other pathogens but a bacteriayeast does not cause trichomoniasis