Progress in vaccination towards hepatitis B control and elimination in the Region of the Americas

BMC Public Health
http://bmcpublichealth.biomedcentral.com/articles
(Accessed 22 April 2017)

Research article
Progress in vaccination towards hepatitis B control and elimination in the Region of the Americas
Alba Maria Ropero Álvarez, Silvia Pérez-Vilar, Carmelita Pacis-Tirso, Marcela Contreras, Nathalie El Omeiri, Cuauhtémoc Ruiz-Matus and Martha Velandia-González
BMC Public Health 2017 17:325
Published on: 17 April 2017
Abstract
Background
Over recent decades, the Region of the Americas has made significant progress towards hepatitis B elimination. We summarize the countries/territories’ efforts in introducing and implementing hepatitis B (HB) vaccination and in evaluating its impact on HB virus seroprevalence.
Methods
We collected information about HB vaccination schedules, coverage estimates, and year of vaccine introduction from countries/territories reporting to the Pan American Health Organization/World Health Organization (PAHO/WHO) through the WHO/UNICEF Joint Reporting Form on Immunization. We obtained additional information regarding countries/territories vaccination recommendations and strategies through communications with Expanded Program on Immunization (EPI) managers and national immunization survey reports. We identified vaccine impact studies conducted and published in the Americas.
Results
As of October 2016, all 51 countries/territories have included infant HB vaccination in their official immunization schedule. Twenty countries, whose populations represent over 90% of the Region’s births, have included nationwide newborn HB vaccination. We estimated at 89% and 75%, the regional three-dose series and the birth dose HB vaccination coverage, respectively, for 2015. The impact evaluations of infant HB immunization programs in the Region have shown substantial reductions in HB surface antigen (HBsAg) seroprevalence.
Conclusion
The achievements of vaccination programs in the Americas suggest that the elimination of perinatal and early childhood HB transmission could be feasible in the short-term. Moreover, the data gathered indicate that the Region may have already achieved the 2020 WHO goal for HB control.