title: Letter: Immunologic deficiencies during viral infection.
mesh_terms: D006801:Humans; D017098:IgA Deficiency; D007153:Immunologic Deficiency Syndromes / Q000150:complications*; D007958:Leukocyte Count; D008231:Lymphopenia / Q000209:etiology; D013601:T-Lymphocytes / Q000276:immunology; D014777:Virus Diseases / Q000150:complications / Q000276:immunology*