I have had many. IT IS NOT FUN! It hurts reallllly bad, more than a normal sore throat. If you let it go for a few days it will hurt so bad you cant swallow. There probably will be white spots at the back of the throat, feels like your throat is bleeding really bad. I also (think) that a fever can accompany it. They test for it by taking a throat culture (all that is they take like a popsicle type stick and two cotton swab things and get the back of the throat so they can test it)
If left untreated it can cause many horrible things to happen, including death. It needs to be treated by a doctor in order for it to go away. It is treated by oral medication. Yes, I beleive a child that young can get it.
Good luck to you, I hope he feels better soon

It's not a fun thing to have, especially for a child that young.
Take care,
Lori
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I wish to be the kind of person my dog thinks I am.