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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
immunology and microbiology
Evidence for a change in the epidemiology of hepatitis B virus infection after nearly two decades of universal hepatitis B vaccination in South Africa
Journal of Medical Virology, Volume 86, No. 6, Year 2014
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Description
The hepatitis B vaccine has been part of the South African Expanded Program on Immunization since April 1995 but its long-term impact remains unknown. This study tested 1,206 sera collected from patients aged 1-25 years from various health facilities across the country for HBV serological markers and HBV DNA. Based on the year the vaccine was introduced, samples were stratified by age into pre- and post-vaccine introduction populations, which were then compared for evidence of immunity and chronic carriage using the Chi-square test. Where HIV status was known, subset analyses were performed. Immunity to HBV infection increased from 13.0% in the pre- to 57.0% in the post-vaccine introduction population (P<0.001). This decreased with increasing age within the post-vaccine introduction population (76.1% for 1-5 years, 50.0% for 6-10 years, and 46.3% for 11-16 years). In addition, HBV chronic carriage was significantly (P=0.003) reduced in the post- (1.4%) compared to the pre-vaccine introduction population (4.2%). The difference in prevalence of active HBV infection in the serologically exposed pre- and post-vaccine introduction populations was not statistically significant. Subset analyses showed that evidence of immunity was significantly (P<0.001) higher in the HIV negative compared to the HIV positive subset in both populations. Universal hepatitis B vaccination has been a remarkable success, with a significant increase in immunity to HBV infection. The observation that HBV chronic carriage increases as immunity wanes over time calls into question whether the time has come to consider a pre-adolescence vaccine booster dose policy. © 2014 Wiley Periodicals, Inc.
Authors & Co-Authors
Amponsah-Dacosta, Edina
South Africa, Pretoria
Sefako Makgatho Health Sciences University Smu
Lebelo, Ramokone Lisbeth
South Africa, Pretoria
Sefako Makgatho Health Sciences University Smu
Rakgole, Johnny Nare
South Africa, Pretoria
Sefako Makgatho Health Sciences University Smu
Burnett, Rosemary J.
South Africa, Pretoria
Sefako Makgatho Health Sciences University Smu
Selabe, Selokela Gloria
South Africa, Pretoria
Sefako Makgatho Health Sciences University Smu
Mphahlele, M. Jeffrey
South Africa, Pretoria
Sefako Makgatho Health Sciences University Smu
Statistics
Citations: 38
Authors: 6
Affiliations: 1
Identifiers
Doi:
10.1002/jmv.23910
ISSN:
01466615
e-ISSN:
10969071
Research Areas
Genetics And Genomics
Health System And Policy
Infectious Diseases
Maternal And Child Health
Study Design
Cross Sectional Study
Study Locations
South Africa