Tonia,
My son just had to get a blood test to see if he had it. He was having a sore throat,cough and fever. And he was very tired. I do know that they are always tired and want to sleep. Dont quote me on all this though. But I hope that your two girls dont end up with it. I know the blood test only took about ten minutes to get the results. I wish you luck. Sorry i was not much help.