Article ; Online: Timing of last COVID-19 vaccine dose and SARS-CoV-2 breakthrough infections in fully (boosted) vaccinated healthcare personnel.
The Journal of hospital infection
2022 Volume 132, Page(s) 46–51
Abstract: Aim: To estimate the incidence, timing and severity of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) breakthrough infections in fully vaccinated healthcare personnel (HCP).: Methods: In total, 6496 fully vaccinated HCP were analysed ... ...
Abstract | Aim: To estimate the incidence, timing and severity of severe acute respiratory syndrome coronavirus-2 (SARS-CoV-2) breakthrough infections in fully vaccinated healthcare personnel (HCP). Methods: In total, 6496 fully vaccinated HCP were analysed prospectively from 15 Results: Overall, 1845 SARS-CoV-2 breakthrough infections occurred (28.4 episodes per 100 HCP), of which 1493 (80.9%) were COVID-19 cases and 352 (19.1%) were asymptomatic infections. Of the 1493 HCP with COVID-19, four were hospitalized for 3-6 days (hospitalization rate among HCP with COVID-19: 0.3%). No intubations or deaths occurred. SARS-CoV-2 breakthrough infections occurred at a mean of 16.2 weeks after the last vaccine dose. Multi-variable regression analyses showed that among the 1845 HCP with a breakthrough infection, the administration of a COVID-19 vaccine dose ≥16.2 weeks before the infection was associated with increased likelihood of developing COVID-19 rather than asymptomatic SARS-CoV-2 infection [odds ratio (OR) 1.58, 95% confidence interval (CI) 1.01-2.46; P=0.045] compared with administering a vaccine dose later. The likelihood of developing COVID-19 compared with asymptomatic infection increased by 7% weekly after the last COVID-19 vaccine dose (OR 1.07, 95% CI 1.03-1.11; P=0.001). Conclusion: SARS-CoV-2 breakthrough infections are common among fully (boosted) vaccinated HCP. However, full COVID-19 vaccination offered considerable protection against hospitalization. These findings may contribute to defining the optimal timing for booster vaccinations. More efficient COVID-19 vaccines that will also confer protection against SARS-CoV-2 infection are needed urgently. |
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MeSH term(s) | Humans ; COVID-19 Vaccines ; COVID-19/epidemiology ; COVID-19/prevention & control ; SARS-CoV-2 ; Breakthrough Infections ; Asymptomatic Infections ; Vaccination ; Delivery of Health Care |
Chemical Substances | COVID-19 Vaccines |
Language | English |
Publishing date | 2022-12-05 |
Publishing country | England |
Document type | Journal Article |
ZDB-ID | 779366-2 |
ISSN | 1532-2939 ; 0195-6701 |
ISSN (online) | 1532-2939 |
ISSN | 0195-6701 |
DOI | 10.1016/j.jhin.2022.11.016 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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