In my life I have had 4 UTIs. The last two came straight after my Covid Vaccinations - one day later for each. My doctor didn't think they were related. Interestingly my daughter, with a different vaccine, had the same outcome.

My GP told me to take some off-the-shelf medication ($100). It did nothing.

I had to beg for antibiotics. Of course I would rather have done without them, but I was petty desperate, and had I known/read about D-mannose, I would have tried it.