COVID-19 vaccine effectiveness was evaluated in close contacts of cases diagnosed during January-April 2021. Among 20,961 contacts, 7,240 SARS-CoV-2 infections were confirmed, with 5,467 being symptomatic and 559 leading to hospitalisations. Non-brand-specific one and two dose vaccine effectiveness were respectively, 35% (95% confidence interval (CI): 25 to 44) and 66% (95% CI: 57 to 74) against infections, 42% (95% CI: 31 to 52) and 82% (95% CI: 74 to 88) against symptomatic infection, and 72% (95% CI: 47 to 85) and 95% (95% CI: 62 to 99) against COVID-19 hospitalisation. The second dose significantly increased effectiveness. Findings support continuing complete vaccination.
机构:
Univ Washington, Fred Hutchinson Canc Res Ctr Vaccine, Dept Pediat, 1100 Fairview Ave North, Seattle, WA 98109 USA
Div Seattle Childrens Hosp, Dept Infect Dis, Seattle, WA USAUniv Washington, Fred Hutchinson Canc Res Ctr Vaccine, Dept Pediat, 1100 Fairview Ave North, Seattle, WA 98109 USA
Waghmare, Alpana
Hijano, Diego R.
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机构:
St Jude Childrens Res Hosp, 262 Danny Thomas Pl Mail Stop 230, Memphis, TN 38105 USAUniv Washington, Fred Hutchinson Canc Res Ctr Vaccine, Dept Pediat, 1100 Fairview Ave North, Seattle, WA 98109 USA
机构:
Univ Washington, Fred Hutchinson Canc Res Ctr Vaccine, Dept Pediat, 1100 Fairview Ave North, Seattle, WA 98109 USA
Div Seattle Childrens Hosp, Dept Infect Dis, Seattle, WA USAUniv Washington, Fred Hutchinson Canc Res Ctr Vaccine, Dept Pediat, 1100 Fairview Ave North, Seattle, WA 98109 USA
Waghmare, Alpana
Hijano, Diego R.
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St Jude Childrens Res Hosp, 262 Danny Thomas Pl Mail Stop 230, Memphis, TN 38105 USAUniv Washington, Fred Hutchinson Canc Res Ctr Vaccine, Dept Pediat, 1100 Fairview Ave North, Seattle, WA 98109 USA
机构:
Inst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Inst Hlth Carlos III, Consortium Biomed Res Epidemiol & Publ Hlth CIBER, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Mazagatos, Clara
Monge, Susana
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Minist Hlth, Ctr Coordinat Alerts & Hlth Emergencies, Gen Directorate Publ Hlth, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Monge, Susana
Olmedo, Carmen
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Minist Hlth, Vaccines Div, Gen Directorate Publ Hlth, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Olmedo, Carmen
Vega, Lorena
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Inst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Inst Hlth Carlos III, Consortium Biomed Res Epidemiol & Publ Hlth CIBER, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Vega, Lorena
Gallego, Pilar
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Inst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Inst Hlth Carlos III, Consortium Biomed Res Epidemiol & Publ Hlth CIBER, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Gallego, Pilar
Martin-Merino, Elisa
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Spanish Agcy Med & Med Devices AEMPS, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Martin-Merino, Elisa
Jose Sierra, Maria
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Minist Hlth, Ctr Coordinat Alerts & Hlth Emergencies, Gen Directorate Publ Hlth, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Jose Sierra, Maria
Limia, Aurora
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Minist Hlth, Vaccines Div, Gen Directorate Publ Hlth, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Limia, Aurora
Larrauri, Amparo
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Inst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain
Inst Hlth Carlos III, Consortium Biomed Res Epidemiol & Publ Hlth CIBER, Madrid, SpainInst Hlth Carlos III, Natl Ctr Epidemiol, Madrid, Spain