Besides intercourse, how can you get trichonomas vaginitis?

Clean all toys. Besides intercourse, trichomoniasis can be transmitted via sex toys. It is very important to clean any toy with the proper antiseptic or at least warm soapy water.
That's the only way. You can only get trichomonas vaginalis by having intercourse with some one who is carrying it.Thats the reason both partners have to be treated to prevent recurrence.