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• W4281609265 endingPage "100023" @default.
• W4281609265 startingPage "100023" @default.
• W4281609265 abstract "Surge of SARS CoV-2 infections ascribed to omicron variant began in December 2021 in New Delhi. We determined the infection and reinfection density in a cohort of health care workers (HCWs) along with vaccine effectiveness (VE) against symptomatic infection within omicron transmission period (considered from December 01, 2021 to February 25, 2022. This is an observational study from the All India Institute of Medical Sciences, New Delhi. Data were collected telephonically. Person-time at risk was counted from November 30, 2021 till date of infection/ reinfection, or date of interview. Comparison of clinical features and severity was done with previous pandemic periods. VE was estimated using test-negative case-control design [matched pairs (for age and sex)]. Vaccination status was compared and adjusted odds ratios (OR) were computed by conditional logistic regression. VE was estimated as (1-adjusted OR)X100-. 11474 HCWs participated in this study. The mean age was 36⋅2 (±10⋅7) years. Complete vaccination with two doses were reported by 9522 (83%) HCWs [8394 (88%) Covaxin and 1072 Covishield (11%)]. The incidence density of all infections and reinfection during the omicron transmission period was 34⋅8 [95% Confidence Interval (CI): 33⋅5–36⋅2] and 45⋅6 [95% CI: 42⋅9–48⋅5] per 10000 person days respectively. The infection was milder as compared to previous periods. VE was 52⋅5% (95% CI: 3⋅9–76⋅5, p = 0⋅036) for those who were tested within 14–60 days of receiving second dose and beyond this period (61–180 days), modest effect was observed. Almost one-fifth of HCWs were infected with SARS CoV-2 during omicron transmission period, with predominant mild spectrum of COVID-19 disease. Waning effects of vaccine protection were noted with increase in time intervals since vaccination. None." @default.
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• W4281609265 date "2022-08-01" @default.
• W4281609265 modified "2023-10-14" @default.
• W4281609265 title "COVID-19 infection, and reinfection, and vaccine effectiveness against symptomatic infection among health care workers in the setting of omicron variant transmission in New Delhi, India" @default.
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• W4281609265 doi "https://doi.org/10.1016/j.lansea.2022.100023" @default.
• W4281609265 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/35769163" @default.
• W4281609265 hasPublicationYear "2022" @default.
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