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Son (14 years old) still had whooping cough in April. Cough remains. Today he coughed up until vomiting during class, as a result, the class teacher called and said to come and pick him up. She also wished for his recovery and said that a medical certificate would be needed. Nothing hurts much, but now I can't take my child to school for this reason? Also, how to ease the cough at school? There is no medical staff at school.