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Protective Effect of COVID-19 Vaccine Among Health Care Workers During the Second Wave of the Pandemic in India

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Protective Effect of COVID-19 Vaccine Among Health Care Workers During the Second Wave of the Pandemic in India Mayo Clinic Proceedings Letter to the Editor Protective Effect of COVID-19 Vaccine Among Health Care Workers During the Second Wave of the Pandemic in India AUTHORS: Peter John Victor, MD, DNB, MAMS, FRACP, FJFICM, FCICM, FICCM, FRCP (Edin), M. Phil Professor, Intensive Care Medicine, Director Christian Medical College Vellore ORCID: 0000-0002-3423-1830 K Prasad Mathews, MD, FRACP Professor, Geriatric Medicine, Medical Superintendent & Chairperson, Hospital Infection Control Committee Christian Medical College Vellore Hema Paul, MD Associate Physician, Department of Microbiology, Member, Hospital Infection Control Committee Christian Medical College Vellore ORCID: Malathi Murugesan, MD Senior Resident, Department of Microbiology, Member Hospital Infection Control Committee Christian Medical College Vellore ORCID: 0000-0003-1250-7557 Joy J Mammen, MD Professor, Department of Transfusion Medicine, Associate Director, Christian Medical College Vellore ORCID: 0000-0002-7349-5660 DISCLOSURES: There is no conflictUncorrected of interest or financial Journal disclosure Pre-Prooffor all the authors listed in this submission CORRESPONDING AUTHOR: Joy J Mammen MD Professor, Department of Transfusion Medicine Christian Medical College Vellore [email protected] +91 416 229 2536 © 2021 Mayo Foundation for Medical Education and Research. Mayo Clin Proc. 2021;96(x):xx-xx. Mayo Clinic Proceedings Letter to the Editor To the Editor: Vaccination has played a major role in eradicating communicable diseases.1 Since healthcare workers, (HCWs) serve in the forefront during pandemics, they are particularly vulnerable. Thus, in the COVID-19 pandemic, it was imperative to vaccinate frontline workers as quickly as possible and ascertain the extent of protection offered by vaccination. Christian Medical College, Vellore, a 2600-bed tertiary care hospital in India with 10600 employees, vaccinated 8991 staff (84.8%) between 21st January 2021 and 30th April 2021. A majority (93.4%) received Covishield™, the Oxford-AstraZeneca vaccine manufactured by Serum Institute of India, and the remainder, Covaxin™, a killed virus vaccine, produced by Bharath Biotech, India. We report the incidence of symptomatic COVID-19Pre-Proof infection among HCWs between 21st February and 19th May 2021. In the 1350 staff tested positive on RT-PCR, the median (interquartile range) age was 33 years (27-41);Journal female: male ratio was 3:2. The median time from first dose to development of infection was 77 (62-89) days and coincided with the second peak in India during April and May 2021. Thirty-three HCWs developed infection within 2-weeks of the second dose of vaccine. Among fully Uncorrectedvaccinated HCWs (n=7080) , 679 (9.6%) developed infection 47 days (34- 58) after the second dose. The risk of infection among fully vaccinated HCWs was significantly lower when compared with unvaccinated HCWs (Relative Risk (RR) 0.35, 95% Confidence interval (CI) 0.32-0.39). Similarly vaccination with two doses reduced hospitalization (RR 0.23; 95%CI 0.16-0.32), need for oxygen therapy (RR 0.08; 95%CI 0.03-0.26) and ICU admission (RR 0.06; 95%CI 0.01-0.27). The protective effect of vaccination in preventing infection, hospitalization, need for oxygen and ICU admission were 65%, 77%, 92% and 94% respectively © 2021 Mayo Foundation for Medical Education and Research. Mayo Clin Proc. 2021;96(x):xx-xx. Mayo Clinic Proceedings Letter to the Editor (Table). The only staff member who died since the beginning of the pandemic had multiple co-morbidities and had not taken the vaccine. Subgroup analysis on the efficacy of the two vaccines was not possible due to few HCWs receiving Covaxin™. Some HCWs (17%) could not take the second dose, initially due to vaccine shortage and subsequently despite vaccine availability, due to changes in guidelines on the interval between doses. A study of 23,324 HCWs in the UK,2 reported vaccine coverage of 89%. During the 2- month follow up, symptomatic and asymptomatic infections occurred in 80 participants (3.8%) among vaccinated and 977 (38%) among unvaccinated.2 In a study from Jerusalem,3 infection occurred over 2-months in 366 (6.9%) of 5297 vaccinated HCWs and 213 of 754 unvaccinated individuals. A third study from California (n=28,184),Pre-Proof showed that only 37 HCWs who received two doses of the vaccine tested positive.4 Our study corroborates these studies that vaccination is protective, although weJournal did not look at the variants responsible for the massive second wave. Beyond the immediate, implications for public health include cost-effective protection from infection, reduction of illness severity and an intervention to break the chain of transmission effectively.Uncorrected Even as many states chose to restrict movement to reduce stress on the healthcare system, we realize that future waves can at best be prevented or at worst mitigated through aggressive and widespread vaccination. © 2021 Mayo Foundation for Medical Education and Research. Mayo Clin Proc. 2021;96(x):xx-xx. Mayo Clinic Proceedings Letter to the Editor References 1. Greenwood B, The contribution of vaccination to global health: past, present and future. Philos Trans R Soc Lond B Biol Sci. 2014;369(1645). 2. Hall VJ, Foulkes S, Saei A, Andrews N, Oguti B, Charlett A, et al. COVID-19 vaccine coverage in health-care workers in England and effectiveness of BNT162b2 mRNA vaccine against infection (SIREN): a prospective, multicentre, cohort study. Lancet. 2021;397:1725-1735. 3. Benenson S, Oster Y, Cohen MJ, Nir-Paz R. BNT162b2 mRNA Covid-19 vaccine effectiveness among health care workers. N Engl J Med. 2021 Mar 23: NEJMc2101951. Published online 2021 Mar 23. doi: 10.1056/NEJMc2101951 4. Keehner J, Horton LE, Pfeffer MA, Longhurst CA, Schooley RT, Currier JS, et al. SARS- CoV2 infection after vaccination in health care workers in California. N Engl J Med. 2021 Mar 23: NEJMc2101927. Published online 2021 Mar 23. doi: 10.1056/NEJMc2101927 Pre-Proof Journal Uncorrected © 2021 Mayo Foundation for Medical Education and Research. Mayo Clin Proc. 2021;96(x):xx-xx. Mayo Clinic Proceedings Letter to the Editor TABLE Details of staff who contracted COVID19 infection after vaccination Not vaccinated Received one RR a Protective effect Fully vaccinated RR b Protective effect of Parameter (n=1609) dose (95% CI) of one dose of (n=7080) c (95% CI) two doses of (n=1878) vaccine e vaccine e Developed 438 200 0.39 61% 679 0.35 65% infection d (27.2) (10.6) (0.34-0.46) (54-66) (9.6) (0.32-0.39) (61-68) Hospitalized d 64 22 0.30 70% 64 0.23 77% (4.0) (1.2) (0.18-0.48) (52-82) (0.9) (0.16-0.32) (68-84) Needed Oxygen 11 0 0.04 94% Pre-Proof4 0.08 92% therapy d (0.7) (0) (0.0-0.63) (37-100) (0.06) (0.03-0.26) (74-97) Needed ICU 8 0 0.05 95% 2 0.06 94% care d (0.5) (0) (0.0-0.87) (13-100) (0.03) (0.01-0.27) (73-99) Deaths 1 0 0.29 Journalf 0 0.08 f (0.01-7.0) (0.0-1.86) RR – Relative risk; CI – Confidence interval; HCW – Health care workers; ICU – Intensive Care Unit a Comparison between non-vaccinated and one dose of vaccine; b Comparison between non-vaccinated and fully vaccinated group; c the fully vaccinated cohort comprised of 7080 HCWs who had completed at least 2-weeks after the second dose; 33 HCWs who developed infection prior to this period were excluded; values in parentheses indicate percentages unless specified; d Proportion Uncorrectedneeding hospitalization, oxygen therapy or ICU admission calculated as among those who were vaccinated or unvaccinated; e protective effect calculated as (1-RR) x 100; f not calculable © 2021 Mayo Foundation for Medical Education and Research. Mayo Clin Proc. 2021;96(x):xx-xx. .
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