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Background: During the COVID-19 pandemic, there was a necessary division of the emergency department (ED) into the COVID suspect zone and a green zone based on a modified "The" Christian Medical college (CMCTS). Triaging was initially done based on the epidemiological criteria and evolved into symptom-based assessment when community transmission began. Methodology: This retrospective study included all patients who were triaged in the ED from April 2020 to December 2020. Data were collected from the ED triage software and were analyzed to determine the performance of the modified triage criteria in admitting patients to the ED. Results: Forty-three thousand patients were triaged during the study. Of which 35.9% (n = 15429) were sent to the COVID suspect zone and 64.1% (n = 27571) to the green zone. Of the 8490 (55%) nasopharyngeal swab reverse transcription polymerase chain reaction (RT-PCR) tests done in the COVID suspect zone, 61.4% were positive for COVID-19 while only 9.2% (n = 274) of 2866 tested in the green zone were positive. COVID-19 positivity was the highest in the mid-pandemic months of July, August, and September 2020. In the COVID suspect zone, factors for predicting a negative RT-PCR result were priority 1 presentation and early and late pandemic presentations. The positive predictive value of our modified triage criteria during the pandemic was 85% with a higher accuracy during the peak of the first wave (July-September 2020). Conclusion: The modified CMCTS successfully segregated COVID-19-positive patients from the COVID-19 negative patients during the first wave of the COVID-19 in 2020. The CMCTS criteria can be easily adopted or adapted in other hospitals in India in case of future waves of COVID-19. [ABSTRACT FROM AUTHOR]

• Mortality rate was 0.2%, 3.5%, 6.2% and 12.9% among fully vaccinated, partially vaccinated, indeterminate and unvaccinated patients respectively. • Prior vaccination impacted severity of infection by reducing the need for oxygen, NIV and ICU admission. COVID-19 vaccines were authorised for emergency use to mitigate the impact of the pandemic. This study evaluated the effect of prior vaccination with either Oxford Astra Zeneca's Covishield™ or Bharath Biotech's Covaxin® on mortality among symptomatic COVID-19 patients during the second wave of the pandemic in India. In this cohort study comprising of RT-PCR confirmed symptomatic COVID-19 patients presenting during April and May 2021, the effect of prior vaccination on mortality (primary outcome), need for hospitalization, oxygen therapy, non-invasive ventilation (NIV) and intensive care unit (ICU) admission were assessed and expressed as risk ratio (RR) with 95% confidence intervals (CI). The mean (SD) age of the cohort (n = 4183) was 46.3 (15.5) years; 17.9% (748/4183) had received at least one dose of Covishield™ and 4.8% (201/4183) had received Covaxin®. Mortality was 0.2% (95% CI: 0.2% – 0.7%), 3.5% (1.9–5.2%), 6.2% (0.3–12%) and 12.9% (11.8–14.1%) among fully vaccinated (>2 weeks after two doses), partially vaccinated (>2 weeks after one dose or <2 weeks after two doses), indeterminate (<2 weeks after one dose) and unvaccinated patients respectively. The difference in mortality among unvaccinated vs. fully vaccinated was 12.7% (95% CI: 11.4–13.9%), unvaccinated vs. partially vaccinated was 9.4% (7.4–11.4%) and unvaccinated vs. indeterminate vaccinated was 6.8% (0.8–12.7%). On adjusted analysis, as compared to unvaccinated patients, at least one dose of vaccine reduced the need for hospitalization (RR: 0.40; 95% CI: 0.35–0.47), oxygen (0.33; 0.27–0.40), NIV (0.23; 0.17–0.32), ICU admission (0.18; 0.12–0.27) and mortality (0.18; 0.11–0.29). Among symptomatic COVID-19 patients, prior vaccination with Covishield ™ or Covaxin® impacted the severity of illness and reduced mortality during a period of widespread delta variant circulation. Full vaccination conferred greater protection than partial vaccination. [ABSTRACT FROM AUTHOR]