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Immune Responses to an Oral Cholera Vaccine in Internally Displaced Persons in South Sudan.

ABSTRACT: Despite recent large-scale cholera outbreaks, little is known about the immunogenicity of oral cholera vaccines (OCV) in African populations, particularly among those at highest cholera risk. During a 2015 preemptive OCV campaign among internally displaced persons in South Sudan, a year after a large cholera outbreak, we enrolled 37 young children (1-5 years old), 67 older children (6-17 years old) and 101 adults (?18 years old), who received two doses of OCV (Shanchol) spaced approximately 3 weeks apart. Cholera-specific antibody responses were determined at days 0, 21 and 35 post-immunization. High baseline vibriocidal titers (>80) were observed in 21% of the participants, suggesting recent cholera exposure or vaccination. Among those with titers ?80, 90% young children, 73% older children and 72% adults seroconverted (?4 fold titer rise) after the 1^st OCV dose; with no additional seroconversion after the 2^nd dose. Post-vaccination immunological endpoints did not differ across age groups. Our results indicate Shanchol was immunogenic in this vulnerable population and that a single dose alone may be sufficient to achieve similar short-term immunological responses to the currently licensed two-dose regimen. While we found no evidence of differential response by age, further immunologic and epidemiologic studies are needed.

SUBMITTER: Iyer AS

PROVIDER: S-EPMC5075787 | biostudies-literature | 2016 Oct

REPOSITORIES: biostudies-literature

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Immune Responses to an Oral Cholera Vaccine in Internally Displaced Persons in South Sudan.

Iyer Anita S AS Bouhenia Malika M Rumunu John J Abubakar Abdinasir A Gruninger Randon J RJ Pita Jane J Lino Richard Lako RL Deng Lul L LL Wamala Joseph F JF Ryan Edward T ET Martin Stephen S Legros Dominique D Lessler Justin J Sack David A DA Luquero Francisco J FJ Leung Daniel T DT Azman Andrew S AS

Scientific reports 20161024

Despite recent large-scale cholera outbreaks, little is known about the immunogenicity of oral cholera vaccines (OCV) in African populations, particularly among those at highest cholera risk. During a 2015 preemptive OCV campaign among internally displaced persons in South Sudan, a year after a large cholera outbreak, we enrolled 37 young children (1-5 years old), 67 older children (6-17 years old) and 101 adults (≥18 years old), who received two doses of OCV (Shanchol) spaced approximately 3 we ...[more]

PMID: 27775046

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Project description:IntroductionHepatitis E (HEV) genotypes 1 and 2 are the common cause of jaundice and acute viral hepatitis that can cause large-scale outbreaks. HEV infection is associated with adverse fetal outcomes and case fatality risks up to 31% among pregnant women. An efficacious three-dose recombinant vaccine (Hecolin) has been licensed in China since 2011 but until 2022, had not been used for outbreak response despite a 2015 WHO recommendation. The first ever mass vaccination campaign against hepatitis E in response to an outbreak was implemented in 2022 in Bentiu internally displaced persons camp in South Sudan targeting 27,000 residents 16-40 years old, including pregnant women.MethodsWe conducted a vaccination coverage survey using simple random sampling from a sampling frame of all camp shelters following the third round of vaccination. For survey participants vaccinated in the third round in October, we asked about the onset of symptoms experienced within 72 hours of vaccination. During each of the three vaccination rounds, passive surveillance of adverse events following immunisation (AEFI) was put in place at vaccination sites and health facilities in Bentiu IDP camp.ResultsWe surveyed 1,599 individuals and found that self-reported coverage with one or more dose was 86% (95% CI 84-88%), 73% (95% CI 70-75%) with two or more doses and 58% (95% CI 55-61%) with three doses. Vaccination coverage did not differ significantly by sex or age group. We found no significant difference in coverage of at least one dose between pregnant and non-pregnant women, although coverage of at least two and three doses was 8 and 14 percentage points lower in pregnant women. The most common reasons for non-vaccination were temporary absence or unavailability, reported by 60% of unvaccinated people. Passive AEFI surveillance captured few mild AEFI, and through the survey we found that 91 (7.6%) of the 1,195 individuals reporting to have been vaccinated in October 2022 reported new symptoms starting within 72 hours after vaccination, most commonly fever, headache or fatigue.ConclusionsWe found a high coverage of at least one dose of the Hecolin vaccine following three rounds of vaccination, and no severe AEFI. The vaccine was well accepted and well tolerated in the Bentiu IDP camp community and should be considered for use in future outbreak response.

Project description:BackgroundGeorgia is leading one of the world's first hepatitis C (HCV) elimination programs alongside interventions to combat a HIV epidemic concentrated among high-risk groups. Although progress has been substantial, neither strategy accounts for the nearly 150,000 internally displaced persons residing in collective centers (CC-IDPs) who are susceptible to deeply integrated risk environments that could promote infection. Achieving dedicated goals for HCV elimination and HIV suppression requires a clear understanding of the risks facing CC-IDPs.ObjectivesThis literature review aims to consolidate what is known about the socio-economic and physical/mental health status of IDPs living in collective centers in Georgia, and to assess their vulnerability to HIV and HCV in light of local and global epidemiological trends.MethodsSources were compiled from journal publications, reports by government ministries and transnational organizations, and the Integrated Household Survey database (2009-2018; updated annually by the National Statistics Office of Georgia) through manual searches in PUBMED, Google Scholar and Search, ProQuest, and digital repositories of government offices.FindingsReports indicate that CC-IDPs are more susceptible to poverty, poor living conditions, mental illness, disability, substance use, and in some cases infectious disease; although, the correlation is not always present and subject to variability. These factors were linked to increased transmission and acquisition of HIV/HCV in both displacement and non-displacement contexts abroad. The geographic concentration of HIV/HCV in areas with greater clusters of CC-IDPs, and shared characteristics with local high-risk groups, indicate the possibility of inordinate transmission among CC-IDPs in Georgia.ConclusionsThe disproportionate prevalence of psychosocial and clinical harms among CC-IDPs testifies to the serious potential of a greater burden of HIV and hepatitis C. Going forward, targeted research is needed to inform interventions and clarify the health status of CC-IDPs in Georgia.

Project description:Internally displaced persons (IDPs) are at high risk for COVID-19 transmission because of congested and unsanitary living conditions. COVID-19 vaccination is essential to build population immunity and prevent severe disease among this population. We determined the prevalence and factors associated with intention to accept COVID-19 vaccine among IDPs in Northeast Nigeria. This cross-sectional study, conducted during July-December 2022, included 1,537 unvaccinated IDPs from 18 IDPs camps. We performed a complex sample survey analysis and described participants' characteristics and vaccination intention with weighted descriptive statistics. We fitted weighted logistic regression models and computed adjusted odds ratios with 95% confidence intervals to identify factors associated with intention to accept COVID-19 vaccine. Of 1,537 IDPs, 55.4% were 18-39 years old, 82.6% were females, and 88.6% had no formal education. Among them, 63.5% (95% CI: 59.0-68.1) expressed intention to accept COVID-19 vaccine. Among the IDPs who intended to reject vaccine, 42.8% provided no reason, 35.3% had COVID-19 misconceptions, 9.5% reported vaccine safety concerns, and 7.4% felt no need. IDPs who perceived COVID-19 as severe (Adjusted Odds Ratio (AOR) = 2.31, [95% CI: 1.35-3.96]), perceived COVID-19 vaccine as effective (AOR = 4.28, [95% CI: 2.46-7.44]) and resided in official camps (AOR = 3.29, [95% CI: 1.94-5.56]) were more likely to accept COVID-19 vaccine. However, IDPs who resided 2 kilometers or farther from the nearest health facility (AOR = 0.34, [95% CI: 0.20-0.58]) were less likely to accept vaccine. Intention to accept COVID-19 vaccine among the IDPs was suboptimal. To improve vaccination acceptance among this population, health education and risk communication should be intensified to counter misinformation, strengthen vaccine confidence, and shape perception of COVID-19 severity, focusing on IDPs in unofficial camps. Appropriate interventions to deliver vaccines to remote households should be ramped up.

Dataset Information

Immune Responses to an Oral Cholera Vaccine in Internally Displaced Persons in South Sudan.

Publications

Immune Responses to an Oral Cholera Vaccine in Internally Displaced Persons in South Sudan.

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