Geographic distribution of HBsAg subtypes in Brazil

HBsAg positive serum samples (896) from five brazilian regions were analysed for HBsAg subtypes. The presence of five different subtypes (ayw2, ayw3, ayw4, adw2 and adw4) was detected. In Northern region subtypes adw4 (41.2%) and adw2 (37.2%) were predominant. In the North East only subtype adw2 was...

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Bibliographic Details
Published in:Memórias do Instituto Oswaldo Cruz 1987-06, Vol.82 (2), p.253-258
Main Authors: GASPAR, A. M. C, YOSHIDA, C. F. T
Format: Article
Language:English
Subjects:
Biological and medical sciences
Brazil
Carrier State - blood
Cross-Sectional Studies
Hepatitis B Surface Antigens - analysis
Hepatitis B Surface Antigens - classification
Hepatitis B virus - immunology
Human viral diseases
Humans
Infectious diseases
Medical sciences
PARASITOLOGY
TROPICAL MEDICINE
Viral diseases
Viral hepatitis
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Summary:HBsAg positive serum samples (896) from five brazilian regions were analysed for HBsAg subtypes. The presence of five different subtypes (ayw2, ayw3, ayw4, adw2 and adw4) was detected. In Northern region subtypes adw4 (41.2%) and adw2 (37.2%) were predominant. In the North East only subtype adw2 was encountered. In Central West, South-East and South, subtypes ayw2, ayw3, adw2 and adw4 were present, with predominance of adw2 in Central West and South East (84.3% and 69.4% respectively) whereas in the South the predominant subtype was ayw3 (41.9%) followed by ayw2 (36.4%). Subtypes ayw1, ayr and adr were not found among the samples studied. These results show the difference in the incidence of HBsAg subtypes in the different regions of Brazil and their significance in relation to the colonization and migrations in this country.
ISSN:0074-0276
1678-8060
1678-8060
0074-0276
DOI:10.1590/S0074-02761987000200013