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Vaccination status and hepatitis A immunity in children: insights from a large-scale study in Turkey.
BMC Infect Dis
January 2025
Department of Pediatrics, Ankara Bilkent City Hospital, Bilkent, Ankara, 06800, Turkey.
Background: Hepatitis A remains a public health concern, particularly in areas with suboptimal sanitation. Introduced in Turkey's immunization schedule in 2011, the vaccine has improved immunity; however, gaps persist, especially in older, unvaccinated children. This study examines the seropositivity rates and antibody levels in children across different vaccination statuses and age groups, and to identify gaps in immunity, particularly among children those born before the introduction of the hepatitis A vaccine in Turkey.
View Article and Find Full Text PDFOrthoflavivirus circulation in South-East Queensland, Australia, before and during the 2021-2022 incursion of Japanese encephalitis virus assessed through sero-epidemiological survey of a sentinel equine population.
One Health
December 2024
School of Chemistry and Molecular Biosciences, Faculty of Science, The University of Queensland, Brisbane, QLD 4072, Australia.
An incursion and outbreak of Japanese encephalitis virus (JEV) was reported in Australia in 2021 and 2022, respectively. There was speculation that JEV may have been circulating in Australia unknowingly prior to the detection. In this study, we determined sero-prevalence and transmission of West Nile virus (WNV), Murray Valley encephalitis virus (MVEV) and JEV, prior to and post JEV incursion in a sentinel equine population in south-east Queensland (SEQ), Australia, using blocking ELISAs (screening test) and virus neutralisation test (confirmatory).
View Article and Find Full Text PDFNationwide population-based infection- and vaccine-induced SARS-CoV-2 antibody seroprevalence in Germany in autumn/winter 2021/2022.
Euro Surveill
January 2025
RKI-SOEP-2 Study Group is acknowledged at the end of the article.
BackgroundThe first Corona Monitoring Nationwide (RKI-SOEP) study (October 2020-February 2021) found a low pre-vaccine SARS-CoV-2 antibody seroprevalence (2.1%) in the German adult population (≥ 18 years).AimThe objective of this second RKI-SOEP (RKI-SOEP-2) study in November 2021-March 2022 was to estimate the prevalence of SARS-CoV-2-specific anti-spike and/or anti-nucleocapsid (anti-N) IgG antibodies (combined seroprevalence), past infection based on infection-induced seroprevalence (anti-N), and basic immunisation (at least two antigen contacts through vaccination or infection) in individuals aged ≥ 14 years.
View Article and Find Full Text PDFDecreasing hepatitis B seroprevalence in pregnant women in Taiwan between 2016 and 2021: a claim-based cohort study.
BMC Public Health
January 2025
Graduate Institute of Data Science, College of Management, Taipei Medical University, Taipei, Taiwan.
Background: Hepatitis B virus (HBV) surface antigen (HBsAg) seroprevalence was high before the national vaccine policy was introduced in Taiwan, indicating significant HBV infection rates. The success of the HBV immunization program and other preventive measures likely led to decreased HBsAg prevalence among pregnant women. This study reports on the HBV seroprevalence among pregnant women in Taiwan from 2016 to 2021, including those potentially affected by the universal hepatitis B vaccination at birth.
View Article and Find Full Text PDFAnti-nucleocapsid SARS-CoV-2 antibody seroprevalence in previously infected persons with immunocompromising conditions-United States, 2020-2022.
PLoS One
January 2025
Office of Public Health Data, Surveillance and Technology, US Centers for Disease Control, Atlanta, Georgia, United States of America.
People with immunocompromising conditions (IC) are at increased risk of severe COVID-19 and death. These individuals show weaker immunogenicity following vaccination than individuals without IC, yet immunogenicity after SARS-CoV-2 infection is poorly understood. To address this gap, the presence of infection-induced antibodies in sera following a positive COVID-19 test result was compared between patients with and without IC.
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