DS1 (11) was off school for two days this week with a heavy cold and hacking cough. By Thursday he was well enough to return to school, though still had a cough and was fine all day. Today I got a phone call from him at the end of school asking me to pick him up (he normally walks). I could hardly understand him on the phone as he was shivering so violently. Brought him home and he's now in bed, saying he feels a bit better but he's still very cold. The puzzling thing is he doesn't have a temperature. He said that it came on very suddenly 20 mins before the end of school, that he could feel his concentration slowing down and he felt as if he was slurring his speech, then began shivering. I've given him paracetamol and he's had a drink. Do you think I should just watch him carefully or is a visit to the Drs in order?