Hepatitis B virus (HBV) infection and recombination between HBV genotypes D and E in asymptomatic blood donors from Khartoum, Sudan

Sudan is a highly endemic area for hepatitis B virus (HBV), and >5% of blood donors are chronically infected. To examine potential strategies to improve HBV blood safety, 404 replacement donor samples previously screened for HBV surface antigen (HBsAg) were tested for antibody to HBV core (anti-H...

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Vydáno v:Journal of clinical microbiology Ročník 49; číslo 1; s. 298
Hlavní autoři: Mahgoub, Shaza, Candotti, Daniel, El Ekiaby, Magdy, Allain, Jean-Pierre
Médium: Journal Article
Jazyk:angličtina
Vydáno: United States 01.01.2011
Témata:
Adolescent
Adult
Blood Donors
Carrier State - virology
DNA, Viral - blood
DNA, Viral - chemistry
DNA, Viral - genetics
Female
Genotype
Hepatitis B - virology
Hepatitis B Antibodies - blood
Hepatitis B Surface Antigens - blood
Hepatitis B virus - classification
Hepatitis B virus - genetics
Hepatitis B virus - isolation & purification
Humans
Male
Middle Aged
Molecular Sequence Data
Recombination, Genetic
Sequence Analysis, DNA
Sudan
Young Adult
Sudan
ISSN:1098-660X, 1098-660X
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Shrnutí:Sudan is a highly endemic area for hepatitis B virus (HBV), and >5% of blood donors are chronically infected. To examine potential strategies to improve HBV blood safety, 404 replacement donor samples previously screened for HBV surface antigen (HBsAg) were tested for antibody to HBV core (anti-HBc), anti-surface antigen (anti-HBs), and HBV DNA. Of 145 anti-HBc-containing samples (36%) identified, 16 retested were HBsAg positive (11%). Anti-HBs was detected in 43/77 (56%) anti-HBc-reactive samples. Six samples were HBsAg(-)/anti-HBc(+)/anti-HBs(+) and contained HBV DNA, meeting the definition of occult HBV infection (OBI). OBIs had low HBV DNA loads (<10 IU/ml) and were genotype B (n = 1) or genotype D (n = 5). Pre-S/S and/or whole genome sequences were obtained from 47 randomly selected HBsAg-positive donors added to the previous 16. Genotype E was identified in 27 strains (57.5%), genotype D in 19 strains (40.5%), and genotype A2 in 1 strain (2%). Two outlier strains within genotype D ultimately were identified as recombinants of genotypes D and E with identical recombination points, suggesting circulating, infectious, recombinant strains. Anti-HBc screening does not appear to be a sustainable blood safety strategy because of the cost and the negative impact on the Sudanese blood supply, even when reduced by anti-HBs testing. Being at the junction between two main African HBV genotypes, genetic recombination occurred and became part of the molecular epidemiology of HBV in Sudan.
Bibliografie:ObjectType-Article-1
SourceType-Scholarly Journals-1
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ISSN:1098-660X
1098-660X
DOI:10.1128/JCM.00867-10