Background: Recurrent respiratory tract infections are common cause of morbidity globally. Some congenital heart diseases that cause increased pulmonary blood flow is a common predisposing factor for a recurrent Respiratory tract infection (RTI) . the rate of recurrent RTI is estimated to be 1. 3 episodes per child per year Objectives: The present study helps to determine the underlyi... https://crowssportes.shop/product-category/used-neckguard/