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Effectiveness of COVID-19 vaccines among children 6–11 years against hospitalization during Omicron predominance in Malaysia

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dc.contributor.authorVivek Jason Jayaraj
dc.contributor.authorMasliyana Husin
dc.contributor.authorJing Lian Suah
dc.contributor.authorPeter Seah Keng Tok
dc.contributor.authorAzahadi Omar
dc.contributor.authorSanjay Rampal
dc.contributor.authorSheamini Sivasampu
dc.date.accessioned2024-08-22T03:51:15Z
dc.date.available2024-08-22T03:51:15Z
dc.date.issued2024
dc.description.abstractThere is currently limited data on the efectiveness of COVID-19 vaccines for children aged 6–11 years in Malaysia. This study aims to determine vaccine efectiveness (VE) against COVID-19-related hospitalization after receipt of one- and two-doses of BNT162b2 mRNA (Comirnaty-Pfzer/BioNTech) vaccine over a duration of almost 1 year in the predominantly Omicron period of BA.4/BA.5 and X.B.B sub lineages. This study linked administrative databases between May 2022 and March 2023 to evaluate real-world vaccine efectiveness (VE) for the BNT162b2 mRNA (Comirnaty-Pfzer/BioNTech) vaccine against COVID-19-related hospitalization in the Omicron pre-dominant period with BA.4/BA.5 and X.B.B sub lineages. During the Omicron-predominant period, the cumulative hospitalization rate was almost two times higher for unvaccinated children (9.6 per million population) compared to vaccinated children (6 per million population). The estimated VE against COVID-19 hospitalization for one dose of BNT162b2 was 27% (95% CI − 1%, 47%) and 38% (95% CI 27%, 48%) for two doses. The estimated VE against hospitalization remained stable when stratifed by time. VE for the frst 90 days was estimated to be 45% (95% CI 33, 55%), followed by 47% (95% CI 34, 56%) between 90 and 180 days, and 36% (95% CI 22, 45%) between 180 and 360 days. Recent infection within 6 months does not appear to modify the impact of vaccination on the risk of hospitalization, subject to the caveat of potential underestimation. In our pediatric population, BNT162b2 provided moderate-non-diminishing protection against COVID-19 hospitalization over almost 1 year of Omicron predominance.
dc.identifier.doihttps://doi.org/10.1038/s41598-024-55899-5
dc.identifier.urihttps://repository.nih.gov.my/handle/123456789/992
dc.language.isoen
dc.relation.ispartofScientific Reports
dc.relation.issn2045-2322
dc.subjectCOVID-19
dc.subjectVaccine efectiveness
dc.subjectHospitalization
dc.subjectMalaysia
dc.titleEffectiveness of COVID-19 vaccines among children 6–11 years against hospitalization during Omicron predominance in Malaysia
dc.typejournal-article
dspace.entity.typePublication
oaire.citation.issue1
oaire.citation.volume14
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