Waning effectiveness against COVID-19-related hospitalization, severe complications, and mortality with two to three doses of CoronaVac and BNT162b2: a case-control study.
Emerg Microbes Infect
; 12(1): 2209201, 2023 Dec.
Artículo
en Inglés
| MEDLINE | ID: covidwho-2320605
ABSTRACT
BACKGROUND:
This study aims to evaluate waning effectiveness against severe and fatal COVID-19 with two to three doses of CoronaVac/BNT162b2, where data are limited.METHODS:
A 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.RESULTS:
By 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%)].CONCLUSIONS:
Significant 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.Palabras clave
Texto completo:
Disponible
Colección:
Bases de datos internacionales
Base de datos:
MEDLINE
Asunto principal:
COVID-19
/
Vacuna BNT162
Tipo de estudio:
Estudio experimental
/
Estudio observacional
/
Estudio pronóstico
Tópicos:
Vacunas
Límite:
Adolescente
/
Adulto
/
Humanos
Idioma:
Inglés
Revista:
Emerg Microbes Infect
Año:
2023
Tipo del documento:
Artículo
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