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.
Some important tips to write a referral letter from doctor are given below; 1  You need to mention following important points regarding patient. â 2  Specialty being referred into. â 3  Relevant medical details.â 4  Reason for referral. â 5  Referral date. â 6  First name and surname of patient. â 7  NHS number.ome important tips to write a referral letter from doctor are given below; 1  You need to mention following important points regarding patient. â 2  Specialty being referred into. â 3  Relevant medical details. â 4  Reason for referral.