Recurrent upper respiratory tract infections and immune defi-ciency in children

The lecture is devoted to results of clinical and immunological investigation of 614 children with 20 forms of primary immunodeficiency states and more than 8000 children with «frequent infections». The observations were performed in children unit of the Institute of Immunology in the years 1981-2010. The main features of primary immunodeficiency and secondary immunodeficiency and the term «immunocompromised child» are analyzed in details.