It is just a viral disease.nothing to worry. Better for children to have this in early age as otherwise you have to more worry about their classes, exams etc. I had this when i was in Indonesia, i was so astonished to see those people take it just as any other disease. Provide normal food and keep in well ventilated room. if possile take them outdoor to get plenty of air. don't give spicy food.avoid itching(This is most difficult with childremn), but make them understand. Face it brave.