I am sure that it is possible, I can not rule out that it is not possible. In most cases not enough scientific tests have been done to disprove a lot of things. Since a poorly maintained hot tub would have bacterial growth then it is possible, but why would you go into a hot tub like that?
If you suspect her of cheating then I would not let this push you over the edge to accuse her.
Thanks. What about the hot tub?
Urethritis can be picked up from many things where bacteria is present.
It can take up to 2 weeks to clear but should notice the symptoms lessening after a couple of days.