My son got diagnosed with hand foot and mouth today. He's the third case in his Pre-K class. I feel…

My son got diagnosed with hand foot and mouth today. He's the third case in his Pre-K class. I feel so bad but it does not seem to be bothering him. It came on suddenly while he was at a school today. Got some lotion from doctor's today for his feet. He's staying at his grandmother's so hopefully the twins will not get it, but at the moment they have a low grade fever of 99, which is nothing.