Association between HBsAg and race in a mixed population of Northeastern Brazil.
The frequency of Australian antigen carriers (HBsAg) was studied in three samples from northeastern Brazil. In sample A there were 1000 women from Tsylla Balbino Maternity in Salvador; in sample B there were 1,512 blood donors from Salvador, and in sample C there were 930 blood donors from Aracaju. In sample A, B and C the observed frequency of carriers (HBsAg) was 1.20%, 1.58% and 2.04% respectively. These differences were not significant (x22 = 2.2; p greater than 0.25). There was no association between the carrier state and sex, age, ABO and Rh blood groups, Chagas' disease and rural origin. However, the frequency of carriers (HBsAg) increases from White to Black, as follows: Whites = 0.5%; Mulattoes = 1.91%, and Black = 1.96% (x22 = 7.91; p less than 0.02).
D000017:ABO Blood-Group System; D000367:Age Factors; D044383:Black People; D001782:Blood Donors; D001938:Brazil; D002353:Carrier State / Q000453:epidemiology; D014355:Chagas Disease / Q000097:blood; D005260:Female; D006509:Hepatitis B / Q000276:immunology*; D006514:Hepatitis B Surface Antigens / Q000032:analysis; D006801:Humans; D008297:Male; D044469:Racial Groups; D012737:Sex Factors; D012959:Socioeconomic Factors; D044465:White People
D000017:ABO Blood-Group System; D006514:Hepatitis B Surface Antigens