COVID-19 vaccines coverage and effectiveness against SARS-CoV-2 infection among residents in the largest Health Authority of Lazio region (Italy): a population-based cohort study.
Expert Rev Vaccines
; 21(8): 1147-1157, 2022 08.
Article
in English
| MEDLINE | ID: covidwho-1852791
ABSTRACT
BACKGROUND:
The waning of the protective effect of COVID-19 vaccines and timing of booster doses are debated.METHODS:
Population-based cohort study in the largest Health-Authority of Lazio region, Italy, on 946,156 residents aged 12+ (study period 1 January 2021-10 January 2022). Vaccine effectiveness (VE) against any SARS-CoV-2 infection (symptomatic or asymptomatic) was estimated through multivariable negative-binomial models using unvaccinated person-time as a reference.RESULTS:
The primary vaccination cycle was completed by 81% of residents; of these, 45% received a booster dose. Vaccine coverages were lower for foreigners, and people living in deprived areas, families with children aged 0-11, and households size 1 or 6+. Overall, VE waned from 71% (95% Confidence Interval (CI) 70-73%) 1 month after the second dose to 43% (CI 41-45%) after 4 months and 24% (CI 21-27%) after 6 months, especially in the elderly aged 70+. We observed a prompt restore of VE 15-19 days after the booster dose (69%, CI 67-70%).CONCLUSIONS:
Our results support the recommendation of a booster dose 4 months after completion of the primary cycle, giving priority to elderly and fragile individuals. The lower vaccine coverage among social disadvantaged subgroups suggests the need of targeted communication and interventions.Keywords
Full text:
Available
Collection:
International databases
Database:
MEDLINE
Main subject:
Vaccines
/
COVID-19
Type of study:
Cohort study
/
Experimental Studies
/
Observational study
/
Prognostic study
Topics:
Vaccines
Limits:
Aged
/
Child
/
Humans
Language:
English
Journal:
Expert Rev Vaccines
Journal subject:
Allergy and Immunology
Year:
2022
Document Type:
Article
Affiliation country:
14760584.2022.2080057
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