My friend had surgery follwing a car accident ,and got MRSA,9 years ago.Now she gets spells with a very high temperature and the old surgical site,develops a red rash and soreness.She has been to various doctors,but no diagnosis has been forthcoming.

Do you really mean 'no diagnosis?'
MRSA and cellulitis are both bacterial skin infections, treated with antibiotics. No doctor has given her antibiotics since the first MRSA?