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.
To call for an appointment at Mayo Clinic in Rochester, Minnesota simply call 1-507-284-2111 and a friendly Mayo Clinic person will patiently answer all your questions, guide you through the process, and make your appointment.
I went to the cardiology department (among others) at the Mayo Clinic (Jacksonville) last month. I have a PPO insurance and was able to self-refer. If you call their 800 number you can make an appointment or you can request one online and they will get back with you. It was an AMAZING experience.