My little girl is 7 months old. Yesterday morning she woke with a fever. She had excessive drowling and a temperature of 101. We brought her to see her doctor and we were informed that she had a case of Herpes 1 virus. He said this could get really bad if untreated. He knew she had it because he saw 3 or 4 canker soars in her throat. With antibiotics she should feel better within 2 or 3 days, but will still be sick with sore throat like symptoms and fever. childrens Ibuprofine has brought her fever down and made her feel alot better. She is in alot of pain, though. :( I was told that this is common in children and babies.
He also said that it is spread between people, not in germs on toys and such. It is a viral infection.
I would get it checked out before it gets bad. Even if turns out to be nothing, at least you checked.