Hepatitis B virus (HBV) infection is a leading cause of cirrhosis and liver cancer in the world. In a recent study published by the United States Centers for Disease Control and Prevention (CDC), researchers report advancements made toward the elimination of mother-to-child transmission (MTCT) of HBV in the World Health Organization (WHO) African Region (AFR) between 2016 and 2021.
Study
In the present study, researchers review official HBV coverage data provided to WHO for information on all 47 AFR countries' immunization activities to generate yearly country vaccination coverage estimates. To this end, a MEDLINE literature review was performed to identify HBsAg seroprevalence surveys specific to the WHO AFR.
Less than or equal to 0.1% HBsAg seroprevalence among children aged five years or younger reflects the elimination of MTCT of HBV. Additional population-based data was acquired from the Demographic Health Survey (DHS) and Population-based HIV Impact Assessment (PHIA) surveys.
Results
In the present study, researchers review official HBV coverage data provided to WHO for information on all 47 AFR countries' immunization activities to generate yearly country vaccination coverage estimates. To this end, a MEDLINE literature review was performed to identify HBsAg seroprevalence surveys specific to the WHO AFR.
Less than or equal to 0.1% HBsAg seroprevalence among children aged five years or younger reflects the elimination of MTCT of HBV. Additional population-based data was acquired from the Demographic Health Survey (DHS) and Population-based HIV Impact Assessment (PHIA) surveys.
The coronavirus disease 2019 (COVID-19) pandemic disrupted immunization activities. As a result, fewer AFR countries could attain over 90% HepB3 coverage, which led to declining values from its peak of 20 to 16 between 2018 and 2021, respectively.
Thus, between 2016 and 2021, four AFR countries introduced HepB-BD to increase HepB-BD coverage. However, regional HepB-BD coverage only increased from 10% to 17% in Nigeria and Senegal.
By 2021, nearly 33 million neonates in AFR countries did not receive timely HepB-BD. These observations highlight the need for strategies to recover immunization activities in AFR countries to ensure that all eligible children who missed HepB3 vaccination receive the recommended doses.
It is also crucial to train healthcare workers to ensure the incorporation of HepB-BD vaccination into neonate care. These efforts will increase timely HepB-BD coverage in all 47 AFR countries. In addition to timely vaccination and better vaccination coverage, identifying pregnant women with HBV infection eligible for treatment with antiviral medications could further reduce MTCT of HBV.
As of 2021, only 17 of 47 AFR countries had national-level policies for HBsAg testing and treatment of neonates. National-level serosurveys were also uncommon in these countries. In the future, HBsAg seroprevalence surveys could help monitor progress and inform policy decisions on HBV control and elimination of MTCT of HBV in this WHO region.
Conclusion
The WHO AFR countries have yet to achieve the HBV elimination goals set in 2016 by the WHO African Regional Committee and endorsed by the World Health Assembly.
To reach these goals, the authors provide several important recommendations, including the establishment of a region-wise verification mechanism for the elimination of MTCT of HBV and disease control in AFR. AFR countries must also increase their HepB-BD vaccination rates to prevent HBV-related morbidity and deaths ultimately.
Source:
https://www.news-medical.net/news/20230727/Recent-progress-in-infant-hepatitis-B-vaccination-efforts-in-Africa.aspx