There's no vaccine for trichomoniasis and it's possible to get
reinfected if you've had it before.
Once you are treated and cured of trichomoniasis, it is possible to get
it again. About 20% of people get infected again within three months after
treatment. To avoid getting reinfected, make sure that all of your sex
partners get tested and treated if infected. Once you have been treated, it is
recommended to wait a week before having sex again.