When I had a yeast infection in my throat, I didn't have the white spots or coating either. I asked my doc how could I have gotten it and he said that it could of been an over usage of antibiotics which at that time I was on plenty of times from strep and sinus infections. I'm not saying this is what you have but just throwing some ideas your way. A sore throat, especially an extremely sore one, is an indication that you have some sort of infection going on whether it's yeast, strep, tonsilitis etc I don't know. Yeast infections are not a form of STD though I imagine it could be a side effect of one but I really don't know a whole lot about STD's. If in the event that it is strep, it would be wise to be seen by a doc right away since untreated strep can leave bacteria in your system to attack other areas of the body. So other then a red throat, there is no bumps, white lesions or the such in there?
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