RESUMO
Blood groups of the ABO system were studied in 186 chronic carriers of typhoid bacilli and in 392 patients with typhoid fever from various districts of the Uzbek SSR. In comparison with control (healthy persons), carriers displayed a higher percentage of persons with A (II) blood group (50.88 and 42.64 against 37.51 and 32.13 in control) and a lesser percentage of persons with the O (I) blood group (21.05 and 22.48 against 32.93 and 32.07 in control). These data demonstrated that predisposition of persons with the A (II) blood group to chronic typhoid carrier state was characteristic of the Asian part of the country. In comparison with control, there were significantly less persons with the O (I) blood group and more with the AB (IV) blood group. Possible correlative mechanisms between the blood group and the typhoid infection and the development of chronic typhoid carrier state is discussed.