Volume 18, Issue 2 (Vol.18, No.2, Summer 2022 2022)
irje 2022, 18(2): 149-154 |
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Aghajarinezhad M, Salimi Y, Rezaeian S, Moradi G, Khosravi Shadmani F, Safari Faramani R, et al . Seroprevalence and Cumulative Incidence of COVID-19 in Ravansar Cohort Study Participants 2020: A Cross-Sectional Study. irje 2022; 18 (2) :149-154
URL: http://irje.tums.ac.ir/article-1-6920-en.html
URL: http://irje.tums.ac.ir/article-1-6920-en.html
Maryam Aghajarinezhad1 
, Yahya Salimi2 , Shahab Rezaeian3 , Ghobad Moradi4 , Fatemeh Khosravi Shadmani5 , Roya Safari Faramani2 , Ebrahim Shakiba6 , Yahya Pasdar7 , Behrooz Hamzeh7 , Nayebali Rezvani8 , Mitra Darbandi9 , Farid Najafi * 10
, Yahya Salimi2 , Shahab Rezaeian3 , Ghobad Moradi4 , Fatemeh Khosravi Shadmani5 , Roya Safari Faramani2 , Ebrahim Shakiba6 , Yahya Pasdar7 , Behrooz Hamzeh7 , Nayebali Rezvani8 , Mitra Darbandi9 , Farid Najafi * 10
1- MSc Student, Student Research Committee, Kermanshah University of Medical Sciences, Kermanshah, Iran
2- Assistant Professor, Social Development and Health Promotion Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
3- Associate Professor, Infectious Diseases Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
4- Professor, Social Determinants of Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
5- Assistant Professor, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
6- Professor, Behavioral Disease Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
7- Associate Professor, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
8- Assistant Professor, Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
9- MSc of Epidemiology, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
10- Professor, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran ,farid_n32@yahoo.com
2- Assistant Professor, Social Development and Health Promotion Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
3- Associate Professor, Infectious Diseases Research Center, Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
4- Professor, Social Determinants of Health Research Center, Research Institute for Health Development, Kurdistan University of Medical Sciences, Sanandaj, Iran
5- Assistant Professor, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
6- Professor, Behavioral Disease Research Center, Kermanshah University of Medical Sciences, Kermanshah, Iran
7- Associate Professor, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
8- Assistant Professor, Department of Clinical Biochemistry, Kermanshah University of Medical Sciences, Kermanshah, Iran
9- MSc of Epidemiology, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran
10- Professor, Research Center for Environmental Determinants of Health (RCEDH), Health Institute, Kermanshah University of Medical Sciences, Kermanshah, Iran ,
Abstract: (545 Views)
Background and Objectives: Serological studies are based on the detection of antibodies. However, the produced antibodies decrease over time; therefore, such methods cannot provide a valid estimate of prevalence and incidence. The present study aimed to determine the serum prevalence and cumulative incidence in the Ravansar cohort population (Youth and RaNCD Cohort) in October 2020.
Methods: A random sample of 716 people aged > 18 years old were selected from the participants in the Ravansar cohort study in October 2020. Euroimmun anti-SARS COV-2 IgG ELISA kits (Lübeck, Germany) were used to measure antibody levels. Seroprevalence was estimated with considering of cut-off = 1, and cumulative incidence (modified and modified based on test specificity) was determined using modeling.
Results: In the present study, the serum prevalence of COVID-19 viral infection in the Ravansar cohort population from 22 October 2020 to 18 November 2020 was estimated to be %35.16 (95%CI: %31.64, %38.79). Modified Cumulative incidence and modified based on test characteristics from 20 February to 18 November 2020 were estimated to be %68.85 and %67.71, respectively.
Conclusion: Although very high cumulative incidence may be a sign of approaching herd immunity, adherence to health protocols is still recommended due to the potential role of asymptomatic cases in transmitting the disease to other members of the community; and the presence of new variants of the virus and reduced antibody levels should be considered.
Methods: A random sample of 716 people aged > 18 years old were selected from the participants in the Ravansar cohort study in October 2020. Euroimmun anti-SARS COV-2 IgG ELISA kits (Lübeck, Germany) were used to measure antibody levels. Seroprevalence was estimated with considering of cut-off = 1, and cumulative incidence (modified and modified based on test specificity) was determined using modeling.
Results: In the present study, the serum prevalence of COVID-19 viral infection in the Ravansar cohort population from 22 October 2020 to 18 November 2020 was estimated to be %35.16 (95%CI: %31.64, %38.79). Modified Cumulative incidence and modified based on test characteristics from 20 February to 18 November 2020 were estimated to be %68.85 and %67.71, respectively.
Conclusion: Although very high cumulative incidence may be a sign of approaching herd immunity, adherence to health protocols is still recommended due to the potential role of asymptomatic cases in transmitting the disease to other members of the community; and the presence of new variants of the virus and reduced antibody levels should be considered.
Type of Study: Short Communication |
Subject:
Epidemiology
Received: 2021/08/9 | Accepted: 2022/09/1 | Published: 2022/09/1
Received: 2021/08/9 | Accepted: 2022/09/1 | Published: 2022/09/1
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