Key Message
Allergic rhinitis (AR) is a cardinal disease in the atopic march. However, the precise course of AR’s development has remained unclear, partly due to the absence of diagnostic criteria for early AR. We investigated AR development in a cohort of high-risk infants with atopic dermatitis and/or food allergy by prospectively observing them for symptoms and sensitization and also their nasal cytology. We found that the prevalence of AR increased markedly between 1 and 3 years of age and was associated with onset of asthma.