Dataset Information

Poliovirus serological assay after the cVDPV1 outbreak in Papua New Guinea: a cross-sectional study from 2020 to 2021.

ABSTRACT:

Background

In June 2018, a type 1 circulating vaccine-derived poliovirus (cVDPV1) outbreak was declared in Papua New Guinea (PNG), resulting in a total of 26 paralytic confirmed cases. Eight vaccination campaign rounds with bivalent oral poliovirus vaccine (bOPV) were carried out in response. Prevalence of neutralizing polio antibodies in children was assessed two years after the outbreak response was completed.

Methods

We conducted a cross-sectional serological survey among children aged 6 months-10 years selected from six provinces in PNG to evaluate seroprevalence of neutralizing polio antibodies to the three poliovirus serotypes and analyse sociodemographic risk factors.

Findings

We included 984 of 1006 enrolled children in the final analysis. The seroprevalence of neutralizing polio antibodies for serotype 1, 2 and 3 was 98.3% (95% CI: 97.4-98.9), 63.1% (95% CI: 60.1-66.1) and 95.0% (95% CI: 93.6-96.3), respectively. Children <1 year had significantly lower type 1 seroprevalence compared to older children (p < 0.001); there were no significant differences in seroprevalence among provinces.

Interpretation

PNG successfully interrupted transmission of cVDPV1 with several high coverage bOPV campaigns and seroprevalence remained high after two years. The emergence of cVDPV strains underscores the importance of maintaining high levels of routine immunization coverage and effective surveillance systems for early detection.

Funding

World Health Organization through a Rotary International IPPC grant.

SUBMITTER: Pomat W

PROVIDER: S-EPMC10777103 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature

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Publications

Poliovirus serological assay after the cVDPV1 outbreak in Papua New Guinea: a cross-sectional study from 2020 to 2021.

Pomat William W Lopez Cavestany Rocio R Jeyaseelan Visalakshi V Ford Rebecca R Gare Janet J Avagyan Tigran T Grabovac Varja V Bettels Deborah D Mekonnen Dessie D Jones Kathryn Ann Vetter KAV Mainou Bernardo Alfredo BA Mach Ondrej O

The Lancet regional health. Western Pacific 20231220

<h4>Background</h4>In June 2018, a type 1 circulating vaccine-derived poliovirus (cVDPV1) outbreak was declared in Papua New Guinea (PNG), resulting in a total of 26 paralytic confirmed cases. Eight vaccination campaign rounds with bivalent oral poliovirus vaccine (bOPV) were carried out in response. Prevalence of neutralizing polio antibodies in children was assessed two years after the outbreak response was completed.<h4>Methods</h4>We conducted a cross-sectional serological survey among child ...[more]

PMID: 38204497

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Project description:BackgroundThe transmission of wild poliovirus (WPV1) and circulating vaccine-derived poliovirus (cVDPV) continues to be a major Public Health Emergency of International Concern. Currently, only Afghanistan and Pakistan remain polio-endemic for WPV1. In response to the co-circulation of VDPV2 with WPV1, the Technical Advisory Group of WHO had recommended two nationwide campaigns of trivalent oral poliovirus vaccine (tOPV) for children aged <5 years in Pakistan in 2020. We assessed the humoral and mucosal immune responses in children who received two doses of tOPV (during vaccination campaigns) in Karachi, Pakistan.MethodsA cross-sectional survey was conducted in four peri-urban sites (Cattle Colony, Ibrahim Hyderi, Ali Akber Shah, Rehri Goth) Karachi, Pakistan. Venous blood samples from children aged between 1 month and 5 years were obtained. Children who were acutely ill, requiring hospitalisation, with primary immunodeficiency, or with a chronic medical illness, were excluded from the study. Stool and serum testing was performed at the National Institute of Health, Pakistan. Sera samples were analysed using microneutralization assays to quantify polio antibodies for all three serotypes: type 1, 2, and 3. The stool samples collected at baseline, 7, 14, and 28 days (after each tOPV dose) were tested for the presence of poliovirus.FindingsOf 285 eligible children, 225 had received both tOPV doses and provided three analysable blood samples, and 193 children provided seven viable stool samples. The seroconversion rate for type 2 was 72% (44/61, 95% CI: 59.8-81.8) after the first tOPV dose; cumulative seroconversion after two doses was 93.4% (95% CI: 84.3-97.4). Seven days after the first and second tOPV campaigns, 32.7% and 18.6% excreted Sabin (vaccine) poliovirus type 2, respectively.InterpretationThe study demonstrated enhanced mucosal immunity as well as a high type 2 seroconversion rate and antibody seroprevalence after two tOPV campaigns.FundingWHO, Geneva, Switzerland.

Project description:BackgroundRoutine immunization programs face many challenges in settings such as Papua New Guinea with dispersed rural populations, rugged geography and limited resources for transport and health. Low routine coverage contributes to disease outbreaks such as measles and the polio that re-appeared in 2018. We report on an in-depth local assessment that aimed to document immunization service provision so as to review a new national strategy, and consider how routine immunization could be better strengthened.MethodsIn East New Britain Province, over 2016 and 17, we carried out a cross-sectional assessment of 12 rural health facilities, staff and clients. The study was timed to follow implementation of a new national strategy for strengthening routine immunization. We used interview, structured observation, and records review, informed by theory-based evaluation, a World Health Organization quality checklist, and other health services research tools.ResultsWe documented strengths and weaknesses across six categories of program performance relevant to national immunization strategy and global standards. We found an immunization service with an operational level of staff, equipment and procedures in place; but one that could reach only half to two thirds of its target population. Stronger routine services require improvement in: understanding of population catchments, tracking the unvaccinated, reach and efficiency of outreach visits, staff knowledge of vaccination at birth and beyond the first year of life, handling of multi-dose vials, and engagement of community members. Many local suggestions to enhance national plans, included more reliable on-demand services, integration of other family health services and increased involvement of men.ConclusionsThe national strategy addresses most local gaps, but implementation and resourcing requires greater commitment. Long-term strengthening requires a major increase in centrally-allocated resources, however there are immediate locally feasible steps within current resources that could boost coverage and quality of routine immunization especially through better population-based local planning, and stronger community engagement. Our results also suggest areas where vaccination campaigns in PNG can contribute to routine immunization services.

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Project description:Background and aimsSexually transmitted infections (STIs) pose a considerable concern for global healthcare systems. We examined the prevalence and correlates of self-reported STIs (SR-STIs) among men and women in Papua New Guinea.MethodsA total of 7,195 women and 4,069 men from Papua New Guinea who participated in the 2016-2018 Demographic and Health Survey were included in this study. Percentages were used to summarize the prevalence of SR-STIs among men and women. A multivariable multilevel binary logistic regression was used to examine the correlates of SR-STIs in men and women.ResultsAn overall 5.9% and 4.6% prevalence of SR-STIs were recorded among women and men, respectively, in Papua New Guinea. The odds of SR-STIs were higher among women who ever tested for HIV (aOR = 2.47, CI: 1.80-3.39), those who had first sex below 20 years (aOR = 1.76, CI: 1.10-2.80), those who watched television less than once a week (aOR = 1.83, CI: 1.13-2.95) and those from the Highlands and Momase regions (aOR = 5.55, CI: 3.30-9.33) compared to their counterparts who never tested for HIV, who had their first sexual intercourse when they were 20 years and above, who did not watch television at all, and those from the Southern Region. For men, the odds of SR-STIs were high among those who ever tested for HIV (aOR = 1.65, CI: 1.11-2.45), those with one (aOR= 2.08, CI: 1.05-4.14) and two or more (aOR = 3.77, CI: 1.49, 9.52) sexual partners excluding spouse in the 12 months preceding the survey, those living in the Highlands region (aOR = 2.52, CI: 1.48-4.29), and those living in communities with medium literacy level (aOR = 2.33, CI: 1.38-3.94) compared to their counterparts who had never tested for HIV, those with zero sexual partners excluding their spouse in the 12 months preceding the survey, those living in the Southern region, and those living in communities with low literacy levels.ConclusionWe recommend that the National AIDS Council of Papua New Guinea through the National HIV and STI 2018-2022 Strategy program should be realigned to address these correlates and ensure that more sexual and reproductive health resources are provided to men and women in the Highlands and Momase regions.

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Dataset Information

Poliovirus serological assay after the cVDPV1 outbreak in Papua New Guinea: a cross-sectional study from 2020 to 2021.

Background

Methods

Findings

Interpretation

Funding

Publications

Poliovirus serological assay after the cVDPV1 outbreak in Papua New Guinea: a cross-sectional study from 2020 to 2021.

Similar Datasets

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