No this is not a virus or indeed any infection causing your son's recurrent croup. This is s well known condition seen in young children under 5 years of age and is known as Spasmodic croup. This condition usually disappears completely by the age of 5 years and often before that age. The cause is unknown, but is not due to an infection. If your son's breathing becomes difficult with an episode of croup it is best to treat him with cortisone. The cortisone can be given via a nebuliser and can be used at a very low dose and is very effective.
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