Often Sick Child, Immune Disorder, Congenital Immunodeficiency, Acquired Immunodeficiency

The author considers the term "often a sick child" and discusses this topic in relation to the gradually maturing immune system. He points out the specifics of different age periods and tries to prove that the not always higher frequency of diseases (especially the most common ones - respiratory tract infections) must have a cause in the immune system. Above all, it is necessary to distinguish between primary-congenital immune disorders, which often require lifelong specialized care, from secondary-acquired disorders, for which it is most important to identify the cause of such a disorder and try to eliminate it. An irreplaceable role in the diagnosis and care of often ill children is played by general practitioners caring for children and adolescents, who know the environment in which the child develops and have the possibility of basic immunological examination to identify more serious immune disorders.