The Effect of Vitamin D Levels on the Frequency of Upper Respiratory Tract Infection in Children

Abstract

Introduction: Vitamin D insufficiency and deficiency affect many systems other than bone and mineral metabolism. In our study, the relationship between the frequency of upper respiratory tract infection (URTI) and Vitamin D levels was investigated. Methods: The records of patients who applied to our pediatric outpatient clinic between 2015 and 2016 and were diagnosed with URTI were evaluated retrospectively. A total of 430 cases whose Vitamin D levels were measured were included in the study. The number of URTIs of patients in the past 1 year was recorded and they were divided into three groups according to their Vitamin D levels. Serum 25 (OH)D levels were considered adequate between 20 and 100 ng/ml, insufficient between 12 and 20 ng/ml, and deficient if