简介：Asthmaisverycommoninchildren;inWesterncountries,itisthemostcommondiagnosisinchilrenadmittedtohospital.Mostsurveysreportthatatlesst10%ofchildrenhavebeendiagnosedwithasthma,andrecentstudiesnotethatupto40-50%ofpre-schoolchildrenhavehadrecurrentwheezeoverthepreceding12mohths.Thereisnowlittledoubtthattheprevalenceofasthmahasincreasedworldwideoverthelast10-20years(Figure1).
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