title: Letter: IgA, Down's syndrome and shigellosis.
mesh_terms: D002353:Carrier State / Q000150:complications* / Q000276:immunology; D004314:Down Syndrome / Q000150:complications* / Q000276:immunology; D004405:Dysentery, Bacillary / Q000150:complications* / Q000276:immunology; D006801:Humans; D007070:Immunoglobulin A / Q000032:analysis*
chemical_list: D007070:Immunoglobulin A