My son has the same thing, sun night he came home with major headaches, couldnt swallow, fever... he woke up on monday, snoreing load, couldnt swallow, drooling, sever chap lips, it looked like gook on his teeth, inside his throat was covered in blisters, outside his troat tender to touch. We went to the doctor, she thought strep or mono as well... the swab test came back negative for Strep and the Mono test came back negative too... BUT she strongly thinks its Mono ... but apparently it takes 4-5 days to become active to show up on a test. She sent us home with NO medication since Strep is a bacteria and Mono is a viral infection. She needs to be sure what it is or the WRONG meds could make you worse. She said to come back in 4-5 days, she will re-test for MONO and if possitive, will give a Steroid and anti-viral medication - but in the meantime, he is at home, in bed, with the chills, and feeling terrible! She also sent the Strep test to the lab to be sure the ressults were correct! -- mY SON IS 17 AND APPARENTLY "MONO is common for teens... but can be very bad around young kids and pregnant women - so i wouldn't mess around.. go see a doctor ! The doctor also said if it's mono, watch for tenderness or swollen stomach pains by the spleen... can get very bad there .... If you have any suggestions, please let me know ! I am so worried about my son.