I really need some advice. I took my son to a&e today with a high fever of 38.5°C, fast breathing and shivering. The doctor seen him and sent us home, just telling us he had a viral infections. We've given him Calpol and steipped him down to his nappy but put a thin sheet over him. His temperature is 39.5°C at the moment and I don't know whether to take him back to the hospital. The only thing that seems wrong with him is his temperature which I've been told is fine as a fever is a good sign he's fighting the viral infection. When should I start to worry? Thank you in advance for any help you give.