Croup is very common indeed at this age. It is usually caused by a virus infection of the larynx [the voicebox]Croup can certainly occur again and often does. Your son's paediatrician will advise the correct treatment to use in case he gets croup again. It may be a good idea to get hold of a nebuliser in order to be able to use a special inhalation called Pulmicort for short periods.
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