Prevalence and Genetic Diversity of Hepatitis B and Delta Viruses in Pregnant Women in Gabon: Molecular Evidence that Hepatitis Delta Virus Clade 8 Originates from and Is Endemic in Central Africa

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Abstract
Hepatitis B virus (HBV) surface antigen (HBsAg) was found in 9.2% of 1,186 pregnant women from Gabon, of whom 10.1% had the HBe antigen and 89.9% had anti-HBe antibodies. Antibodies to the hepatitis delta virus (HDV) were found in 15.6% of the HBsAg-positive women. The HBV strains were of the A3 and E genotypes. The HDV strains belonged to HDV clades 1 and 8. These results provide clear evidence that HDV clade 8 is indigenous to Africa.