Total IgE plasma levels vary according to gender and age in Brazilian patients with allergic rhinitis.

Objective: Allergic rhinitis is a disease that affects the upper airways and causes inflammation of the nasal mucosa and it is mediated by IgE antibodies produced after sensitization to environmental allergens. Previous reports have indicated that this disease affects males more often than females. The objective of this study was to verify whether total IgE plasma levels vary between genders in patients suffering from allergic rhinitis.

Evidence of an association between the O blood group and allergic rhinitis.

Objective: The aim of this study was to verify if ABO phenotypes are associated with allergic rhinitis.

Methods: 168 patients with allergic rhinitis and 168 control individuals from the same geographical region and paired by gender and age were enrolled in the study. ABO phenotypes were identified in red blood cells using the hemagglutination technique.