A reduction in chronic hepatitis B virus infection prevalence among children in Vietnam demonstrates the importance of vaccination

Highlights • This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. • A total of 6,949 children were included in the survey analyses. • The overall HBsAg prevalence among surveyed children was 2.70%. • Unadjusted HBsAg prevalence amon...

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Published inVaccine Vol. 32; no. 2; pp. 217 - 222
Main Authors Nguyen, Tran Hien, Vu, Minh Huong, Nguyen, Van Cuong, Nguyen, Lien Huong, Toda, Kohei, Nguyen, Tuyet Nga, Dao, Sang, Wannemuehler, Kathleen A, Hennessey, Karen A
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Abstract Highlights • This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. • A total of 6,949 children were included in the survey analyses. • The overall HBsAg prevalence among surveyed children was 2.70%. • Unadjusted HBsAg prevalence among children with ≥3 doses of hepatitis B vaccine including a birth dose (1.75%) was significantly lower than among children with ≥3 doses of hepatitis B vaccine but lacked a birth dose (2.98%). • Childhood chronic HBV infection prevalence has been markedly reduced in Vietnam due to vaccination.
AbstractList •This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design.•A total of 6,949 children were included in the survey analyses.•The overall HBsAg prevalence among surveyed children was 2.70%.•Unadjusted HBsAg prevalence among children with ≥3 doses of hepatitis B vaccine including a birth dose (1.75%) was significantly lower than among children with ≥3 doses of hepatitis B vaccine but lacked a birth dose (2.98%).•Childhood chronic HBV infection prevalence has been markedly reduced in Vietnam due to vaccination. Vietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first introduced in the national childhood immunization program in 1997 in high-risk areas, expanded nationwide in 2002, and included birth dose vaccination in 2003. This survey aimed to assess the impact of Vietnam's vaccination programme by estimating the prevalence of hepatitis B surface antigen (HBsAg) among children born during 2000–2008. This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. Demographic and vaccination data were collected along with a whole blood specimen that was collected and interpreted in the field with a point-of-care HBsAg test. A total of 6,949 children were included in the survey analyses. The overall HBsAg prevalence among surveyed children was 2.70% (95% confidence interval (CI): 2.20–3.30). However, HBsAg prevalence was significantly higher among children born in 2000–2003 (3.64%) compared to children born 2007–2008 (1.64%) (prevalence ratio (PR: 2.22, CI 1.55–3.18)). Among all children included in the survey, unadjusted HBsAg prevalence among children with ≥3 doses of hepatitis B vaccine including a birth dose (1.75%) was significantly lower than among children with ≥3 doses of hepatitis B vaccine but lacked a birth dose (2.98%) (PR: 1.71, CI: 1.00–2.91) and significantly lower than among unvaccinated children (3.47%) (PR: 1.99, CI: 1.15–3.45). Infants receiving hepatitis B vaccine >7 days after birth had significantly higher HBsAg prevalence (3.20%) than those vaccinated 0-1 day after birth (1.52%) (PR: 2.09, CI: 1.27–3.46). Childhood chronic HBV infection prevalence has been markedly reduced in Vietnam due to vaccination. Further strengthening of timely birth dose vaccination will be important for reducing chronic HBV infection prevalence of under 5 children to <1%, a national and Western Pacific regional hepatitis B control goal.
Background: Vietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first introduced in the national childhood immunization program in 1997 in high-risk areas, expanded nationwide in 2002, and included birth dose vaccination in 2003. This survey aimed to assess the impact of Vietnam's vaccination programme by estimating the prevalence of hepatitis B surface antigen (HBsAg) among children born during 2000-2008.
Background Vietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first introduced in the national childhood immunization program in 1997 in high-risk areas, expanded nationwide in 2002, and included birth dose vaccination in 2003. This survey aimed to assess the impact of Vietnam's vaccination programme by estimating the prevalence of hepatitis B surface antigen (HBsAg) among children born during 2000-2008. Methods This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. Demographic and vaccination data were collected along with a whole blood specimen that was collected and interpreted in the field with a point-of-care HBsAg test. Results A total of 6,949 children were included in the survey analyses. The overall HBsAg prevalence among surveyed children was 2.70% (95% confidence interval (CI): 2.20-3.30). However, HBsAg prevalence was significantly higher among children born in 2000-2003 (3.64%) compared to children born 2007-2008 (1.64%) (prevalence ratio (PR: 2.22, CI 1.55-3.18)). Among all children included in the survey, unadjusted HBsAg prevalence among children with >=3 doses of hepatitis B vaccine including a birth dose (1.75%) was significantly lower than among children with >=3 doses of hepatitis B vaccine but lacked a birth dose (2.98%) (PR: 1.71, CI: 1.00-2.91) and significantly lower than among unvaccinated children (3.47%) (PR: 1.99, CI: 1.15-3.45). Infants receiving hepatitis B vaccine >7 days after birth had significantly higher HBsAg prevalence (3.20%) than those vaccinated 0-1 day after birth (1.52%) (PR: 2.09, CI: 1.27-3.46). Conclusion Childhood chronic HBV infection prevalence has been markedly reduced in Vietnam due to vaccination. Further strengthening of timely birth dose vaccination will be important for reducing chronic HBV infection prevalence of under 5 children to <1%, a national and Western Pacific regional hepatitis B control goal.
Vietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first introduced in the national childhood immunization program in 1997 in high-risk areas, expanded nationwide in 2002, and included birth dose vaccination in 2003. This survey aimed to assess the impact of Vietnam's vaccination programme by estimating the prevalence of hepatitis B surface antigen (HBsAg) among children born during 2000-2008. This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. Demographic and vaccination data were collected along with a whole blood specimen that was collected and interpreted in the field with a point-of-care HBsAg test. A total of 6,949 children were included in the survey analyses. The overall HBsAg prevalence among surveyed children was 2.70% (95% confidence interval (CI): 2.20-3.30). However, HBsAg prevalence was significantly higher among children born in 2000-2003 (3.64%) compared to children born 2007-2008 (1.64%) (prevalence ratio (PR: 2.22, CI 1.55-3.18)). Among all children included in the survey, unadjusted HBsAg prevalence among children with ≥3 doses of hepatitis B vaccine including a birth dose (1.75%) was significantly lower than among children with ≥3 doses of hepatitis B vaccine but lacked a birth dose (2.98%) (PR: 1.71, CI: 1.00-2.91) and significantly lower than among unvaccinated children (3.47%) (PR: 1.99, CI: 1.15-3.45). Infants receiving hepatitis B vaccine >7 days after birth had significantly higher HBsAg prevalence (3.20%) than those vaccinated 0-1 day after birth (1.52%) (PR: 2.09, CI: 1.27-3.46). Childhood chronic HBV infection prevalence has been markedly reduced in Vietnam due to vaccination. Further strengthening of timely birth dose vaccination will be important for reducing chronic HBV infection prevalence of under 5 children to <1%, a national and Western Pacific regional hepatitis B control goal.
BACKGROUNDVietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first introduced in the national childhood immunization program in 1997 in high-risk areas, expanded nationwide in 2002, and included birth dose vaccination in 2003. This survey aimed to assess the impact of Vietnam's vaccination programme by estimating the prevalence of hepatitis B surface antigen (HBsAg) among children born during 2000-2008. METHODSThis nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. Demographic and vaccination data were collected along with a whole blood specimen that was collected and interpreted in the field with a point-of-care HBsAg test. RESULTSA total of 6,949 children were included in the survey analyses. The overall HBsAg prevalence among surveyed children was 2.70% (95% confidence interval (CI): 2.20-3.30). However, HBsAg prevalence was significantly higher among children born in 2000-2003 (3.64%) compared to children born 2007-2008 (1.64%) (prevalence ratio (PR: 2.22, CI 1.55-3.18)). Among all children included in the survey, unadjusted HBsAg prevalence among children with ≥3 doses of hepatitis B vaccine including a birth dose (1.75%) was significantly lower than among children with ≥3 doses of hepatitis B vaccine but lacked a birth dose (2.98%) (PR: 1.71, CI: 1.00-2.91) and significantly lower than among unvaccinated children (3.47%) (PR: 1.99, CI: 1.15-3.45). Infants receiving hepatitis B vaccine >7 days after birth had significantly higher HBsAg prevalence (3.20%) than those vaccinated 0-1 day after birth (1.52%) (PR: 2.09, CI: 1.27-3.46). CONCLUSIONChildhood chronic HBV infection prevalence has been markedly reduced in Vietnam due to vaccination. Further strengthening of timely birth dose vaccination will be important for reducing chronic HBV infection prevalence of under 5 children to <1%, a national and Western Pacific regional hepatitis B control goal.
Highlights • This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. • A total of 6,949 children were included in the survey analyses. • The overall HBsAg prevalence among surveyed children was 2.70%. • Unadjusted HBsAg prevalence among children with ≥3 doses of hepatitis B vaccine including a birth dose (1.75%) was significantly lower than among children with ≥3 doses of hepatitis B vaccine but lacked a birth dose (2.98%). • Childhood chronic HBV infection prevalence has been markedly reduced in Vietnam due to vaccination.
Author Hennessey, Karen A
Wannemuehler, Kathleen A
Nguyen, Tran Hien
Vu, Minh Huong
Nguyen, Tuyet Nga
Nguyen, Lien Huong
Toda, Kohei
Nguyen, Van Cuong
Dao, Sang
AuthorAffiliation d World Health Organization, Western Pacific Regional Office, Manila, Philippines
a National Insitutute of Hygience and Epidemiology, Hanoi, Vietnam
b Program for Appropriate Technology in Health (PATH), Hanoi, Vietnam
e Center for Disease Control and Prevention, USA
c World Health Organization, Hanoi, Vietnam
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  fullname: Nguyen, Van Cuong
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Issue 2
Keywords Birth dose vaccination
Immunization
Hepatitis B virus
Seroprevalence
Human
Prevalence
Tropical zone
Vaccination
Orthohepadnavirus
Hepatic disease
Serology
Vaccine
Epidemiology
Infection
Virus
Viral hepatitis B
Hepadnaviridae
Viral disease
Digestive diseases
Child
Language English
License CC BY 4.0
Copyright © 2013 Elsevier Ltd. All rights reserved.
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Snippet Highlights • This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design. • A total of 6,949...
•This nationally representative cross-sectional survey sampled children based on a stratified three-stage cluster design.•A total of 6,949 children were...
Vietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first introduced in the...
Background Vietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first...
BACKGROUNDVietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first introduced...
Background: Vietnam has high endemic hepatitis B virus infection with >8% of adults estimated to have chronic infection. Hepatitis B vaccine was first...
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SubjectTerms Allergy and Immunology
Applied microbiology
Biological and medical sciences
Birth dose vaccination
Caregivers
Child
Children & youth
Confidence intervals
Cross-Sectional Studies
Ethnicity
Female
Fundamental and applied biological sciences. Psychology
Health facilities
Hepatitis
Hepatitis B Surface Antigens - blood
Hepatitis B Vaccines - therapeutic use
Hepatitis B virus
Hepatitis B, Chronic - epidemiology
Hepatitis B, Chronic - prevention & control
Human viral diseases
Humans
Immunization
Immunization Programs
Immunization, Secondary
Infections
Infectious diseases
Male
Medical sciences
Microbiology
Miscellaneous
Polls & surveys
Population density
Prevalence
Sample size
Seroprevalence
Stratigraphy
Vaccines
Vaccines, antisera, therapeutical immunoglobulins and monoclonal antibodies (general aspects)
Vietnam - epidemiology
Viral diseases
Viral hepatitis
Virology
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Title A reduction in chronic hepatitis B virus infection prevalence among children in Vietnam demonstrates the importance of vaccination
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