Most sore throats are caused by colds, the flu, coxsackie virus or mono (mononucleosis). Bacteria that can cause pharyngitis in some cases: 1  Strep throat is caused by group A streptococcus.  Less commonly, bacterial diseases such as gonorrhea and chlamydia can cause sore throat.
Do you need a doctor's referral for an appointment? Some specialty areas at Mayo require a doctor's referral, and some do not. Most insurance plans require a referral from a plan doctor in order to get access to Mayo Clinic. You should check with your insurance company or your doctor prior to seeking care at Mayo.
I would call the Mayo Clinic or call your insurance company. Your ins. co. should be able to tell you if they will require a referral. Mayo Clinic will also be able to tell you all the requirements for getting in there. I think you can also have them just do a records review and second opinion without having to actually go there if you wanted to do that.