title: Possible relationships between IgA deficiency and recurrent respiratory infection.
mesh_terms: D000917:Antibody Formation; D001980:Bronchi / Q000378:metabolism; D002648:Child; D002675:Child, Preschool; D005122:Exudates and Transudates / Q000032:analysis; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis; D007136:Immunoglobulins / Q000032:analysis*; D007153:Immunologic Deficiency Syndromes / Q000150:complications*; D007223:Infant; D012141:Respiratory Tract Infections / Q000276:immunology*; D014132:Trachea / Q000378:metabolism; D005719:gamma-Globulins / Q000032:analysis
chemical_list: D007070:Immunoglobulin A; D007136:Immunoglobulins; D005719:gamma-Globulins