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  1. 2021
    “…Using the territory-wide public healthcare and vaccination records of over 2.5 million individuals in Hong Kong, we examined the potentially differential risk of SARS-CoV-2 infection, hospitalization, and mortality between those receiving two homologous doses of BNT162b2 or CoronaVac versus those with a previous infection receiving only one dose amid the Omicron epidemic. Results show a single dose after a SARS-CoV-2 infection is associated with a lower risk of infection (BNT162b2: adjusted incidence rate ratio [IRR] = 0.475, 95% CI: 0.410–0.550; CoronaVac: adjusted IRR = 0.397, 95% CI: 0.309–0.511) and no significant difference was detected in the risk of COVID-19-related hospitalization or mortality compared with a two-dose vaccination regimen. …”
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  2. 2022
  3. 2023
  4. 2024
  5. 2025
    “…This study aimed to determine how many HCWs burned out during the Omicron wave of the COVID-19 pandemic and determine what factors put them at risk for this psychological effect. …”
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  6. 2026
    “…The different ratio between mutant p53 status in the primary tumor and distant metastasis originating HNSCC may serve to select the best therapeutic target for activating an abscopal effect by radiotherapy as a “booster” of the immune system. …”
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  7. 2027
  8. 2028
  9. 2029
    “…In November 2021, Mexican authorities reported Omicron’s presence in the country. In this study, we infer the first introductory events of Omicron and the impact that human mobility has had on the spread of the virus. …”
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  10. 2030
  11. 2031
  12. 2032
    “…METHODS: To fast curtained the Omicron epidemic, based on the routine surveillance on the risk population of SARS-CoV-2 infection, we identify key places of the epidemic and implement enhanced control measures against Omicron. …”
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  13. 2033
  14. 2034
    “…CONCLUSIONS: The invasion of the Omicron variant caused the new pandemic waves in the six countries. …”
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  15. 2035
  16. 2036
    “…BACKGROUND: It sparked considerable attention from international media when Denmark lifted restrictions against COVID-19 in February 2022 amidst widespread transmission of the new SARS-CoV-2 Omicron variant and a steep rise in reported COVID-19 mortality based on the 30-day COVID-19 death count. …”
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  17. 2037
    “…(1) Background: The assessment of vaccine effectiveness against the Omicron variant is vital in the fight against COVID-19, but research on booster vaccine efficacy using nationwide data was lacking at the time of writing. …”
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  18. 2038
    “…Background: In late February 2022, the Omicron epidemic swept through Shanghai, and the Shanghai government responded to it by adhering to a dynamic zero-COVID strategy. …”
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  19. 2039
    “…To better understand the driving forces leading to new subtypes of SARS-CoV-2, we infected an ex vivo cell model of the human upper respiratory tract with Alpha and Omicron BA.1 variants for one month. Although viral RNA was detected during the entire course of the infection, infectious virus production decreased over time. …”
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  20. 2040
    “…In this study, 6.7 million (all publicly available data from 2020/04/01 to 2022/04/01) SARS-CoV-2 genomes were analyzed to track the origin and evolution of Omicron variants and to reveal the genetic pathways of the generation of core mutations in Omicron. …”
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