**3. Prevalence**

The prevalence of LAR is uncertain and was long considered a rare disorder. In recent years, with the improvement of diagnostic methods, new and surprising data has emerged. In 2012 Rondon et al. reported a prevalence of 25.7% of LAR among a group of 428 adult patients with chronic rhinitis. In the same cohort, 63.1% were diagnosed with AR and 11.2% with non-allergic rhinitis (NAR). The most frequently causative allergen in both LAR and AR was *D. pteronyssinus* (*house dust mite*) [4]. Similar ratio between LAR and AR was reported by Bozek et al. among 219 elderly patients (mean age 65.8 years). The prevalence of LAR was 21% and that of AR was 40.2%, and *again D. pteronyssinus* was found to be the major culprit allergen [5]. However, this data was obtained in selected populations of patients with chronic rhinitis, while the prevalence of LAR in the general population is yet to be established.
