ArticleEmerging microbes & infections2023
Waning effectiveness against COVID-19-related hospitalization, severe complications, and mortality with two to three doses of CoronaVac and BNT162b2: a case-control study.
Article in Emerging microbes & infections, 2023. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 5 papers.
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Who cites it
5 citing papers in PubMed, 9 citations in OpenAlex.
- Estimating the Waning Effectiveness of COVID-19 Vaccines From Population-Level Surveillance Data in Hong Kong.The Journal of infectious diseases · 2025Article
- Booster vaccines dose reduced mortality in hospitalized COVID-19 patients requiring oxygen supplementation: Evidence from the Beijing Omicron outbreak.Human vaccines & immunotherapeutics · 2024Article
- COVID-19 vaccine effectiveness against SARS-CoV-2-confirmed hospitalisation in the eastern part of the WHO European Region (2022-2023): a test-negative case-control study from the EuroSAVE network.The Lancet regional health. Europe · 2024Article
- Risk factors for long-term cardiovascular post-acute sequelae of COVID-19 infection: A nested case-control study in Hong Kong.NPJ cardiovascular health · 2024Article
- Clinical and virological features of asymptomatic and mild symptomatic patients with SARS-CoV-2 Omicron infection at Shanghai Fangcang shelter hospital.Immunity, inflammation and disease · 2023Observational
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Authors and funding
14 authors at 4 institutions in 3 countries.
Funding
Abstract
backgroundThis study aims to evaluate waning effectiveness against severe and fatal COVID-19 with two to three doses of CoronaVac/BNT162b2, where data are limited.
methodsA case-control study included individuals aged ≥18 years, unvaccinated or received two to three doses of CoronaVac/BNT162b2, using electronic healthcare databases in Hong Kong. Those with first COVID-19-related hospitalization, severe complications, or mortality between 1 January and 15 August 2022 were defined as cases and matched with up-to-10 controls by age, sex, index date, and Charlson Comorbidity Index. Vaccine effectiveness (VE) against COVID-19-related outcomes was estimated at different time intervals from second and third-dose vaccination (0-13 up-to 210-240 days) using conditional logistic regression adjusted for comorbidities and medications.
resultsBy 211-240 days after second dose, VE against COVID-19-related hospitalization reduced to 46.6% (40.7-51.8%) for BNT162b2 and 36.2% (28.0-43.4%) for CoronaVac, and VE against COVID-19-related mortality were 73.8% (55.9-84.4%) and 76.6% (60.8-86.0%). After third dose, VE against COVID-19-related hospitalization decreased from 91.2% (89.5-92.6%) for BNT162b2 and 76.7% (73.7-79.4%) for CoronaVac at 0-13 days, to 67.1% (60.4-72.6%) and 51.3% (44.2-57.5%) at 91-120 days. VE against COVID-19-related mortality for BNT162b2 remained high from 0-13 days [98.2% (95.0-99.3%)] to 91-120 days [94.6% (77.7-98.7%)], and for CoronaVac reduced from 0-13 days [96.7% (93.2-98.4%)] to 91-120 days [86.4% (73.3-93.1%)].
conclusionsSignificant risk reduction against COVID-19-related hospitalization and mortality after CoronaVac or BNT162b2 vaccination was observed for >240 and >120 days after second and third doses compared to unvaccinated, despite significant waning over time. Timely administration of booster doses could provide higher levels of protection.
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