It sounds as if your son has whooping cough. This illness is not the classic form of whooping cough but an illness known as 'parapertussis' which closely mimics whooping cough.This cough can last for 3 months and no cough medicines will help.Epidemics of this illness often occur at this time of year.It would still be worthwhile giving your son a course of Klacid antibiotic or Erythromycin antibiotic for 5 days although it is late in the illness.A short course of Predisone 30mg once daily for 5 days will also help. After that he will no longer be infectious and can return to school. If the cough persists it would be worth trying to give him Aterax tablets 25mg at night-this is an antihistamine tablet that often helps to reduce the coughing spells.
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