en Community Health Community Health Study Protocol Study Protocol <strong>Background: </strong>The worldwide emergence and rapid expansion of COVID-19 emphasizes the need to assess the knowledge gap and to predict the disease-related behaviors and reactions during this epidemic.<br> &nbsp;&nbsp; <strong>Methods and design:</strong> COVID19 Population Survey of Iran (COPSIR) is a repeated cross sectional survey that will be conducted in 8 waves. In each wave, 515 Iranian adults aged 18 years or older will be randomly selected and interviewed by phone. The study waves will be performed at approximately weekly intervals. The survey tool is adapted from COSMO (COVID-19 Snapshot MOnitoring) study. This study will provide information on trends of knowledge, risk perception, preventive behaviors, psychological problems, essential needs, and public trust among Iranian adults during COVID-19 epidemic.<br> <strong>&nbsp; &nbsp;Discussion: </strong>The key findings of each wave will be immediately reported to the National Headquarters for Coronavirus Control to set better policies for disease control and prevention. Moreover, if a message is extracted from the results of this study that needs to be communicated to the public, it will be done through the mass media. COVID-19, Knowledge, Risk perception, Preventive behaviors, Psychological problems, Public trust 363 365 http://mjiri.iums.ac.ir/browse.php?a_code=A-10-5942-1&slc_lang=en&sid=1 Leila Janani janani.l@iums.ac.ir 200319475328460063992 200319475328460063992 Yes Preventive Medicine and Public Health Research Center, Psychosocial Health Research Institute (PHRI) & Department of Biostatistics, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Ahmad Hajebi hajebi.a@iums.ac.ir 200319475328460063993 200319475328460063993 No Research Center for Addiction and Risky Behaviors (ReCARB), Psychosocial Health Research Institute (PHRI), & Department of Psychiatry, School of Medicine, Iran University of Medical Sciences, Tehran, Iran Hajar Nazari hajar.nazarihhh@yahoo.com 200319475328460063994 200319475328460063994 No Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Neda Esmailzadehha esmailzadehha.n@tak.iums.ac.ir 200319475328460063995 200319475328460063995 No Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Leila Molaeipour leilamolaei_epi@yahoo.com 200319475328460063996 200319475328460063996 No Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Fatemeh Varse f.varse@yahoo.com 200319475328460063997 200319475328460063997 No Department of Epidemiology, School of Public Health, Iran University of Medical Sciences, Tehran, Iran Mehrdad Eftekhar mehrdad.eftekhar@gmail.com 200319475328460063998 200319475328460063998 No Department of Psychiatry, School of Medicine, Iran University of Medical Sciences, Tehran, Iran Cornelia Betsch cornelia.Betsch@uni-erfurt.de 200319475328460063999 200319475328460063999 No Center for Empirical Research in Economics and Behavioral Sciences (CEREB), Media and Communication Science, University of Erfurt, Erfurt, Germany Seyed Abbas Motevalian motevalian.a@iums.ac.ir 200319475328460064000 200319475328460064000 No