Prevalence of persistent nasal symptoms
Table 3 summarizes the changes in the prevalences of the nasal symptoms, nasal cytology findings and HDM sensitization during the 2-year observation period. The prevalence of each of sneezing, runny nose, nasal eosinophils and positive HDM-specific IgE increased significantly from enrollment to the 2nd-year visit. Although the high initial prevalence of neutrophils in the nasal secretions increased even further over the 2 years, the eosinophil/neutrophil ratio also increased, indicating that nasal eosinophilia became progressively prevalent in early childhood.