Tehran University of Medical Sciences Acta Medica Iranica 0044-6025 59 10 2021 11 10 599 603 Arezu Najafi Occupational Sleep Research Center, Baharloo Hospital, Tehran University of Medical Sciences, Tehran, Iran Khosro Sadeghniiat Haghighi Occupational Sleep Research Center, Baharloo Hospital, Tehran University of Medical Sciences, Tehran, Iran Esmaeil Mohammadnejad Department of Medical Surgical Nursing, School of Nursing and Midwifery, Tehran University of Medical Sciences, Tehran, Iran Seyed Ali Dehghan Manshadi Department of Infectious Disease and Tropical Medicine, School of Medicine, Tehran University of Medical Sciences, Tehran, Iran. Nazanin Izadi Center for Research on Occupational Disease, Tehran University of Medical Sciences, Tehran, Iran. 2021 01 10 2021 08 23 Hospital-related infections have been widely reported during the Covid-19 outbreak that exposes healthcare professionals to at greater risk of infection. This cross-sectional study was designed to evaluate the frequency of absenteeism in hospital staff during the first and second months of the Covid-19 pandemic, from 26 February until 19 April 2020. Occupational data and sickness absenteeism characteristics were collected from the records of the nursing management department. 304 (17.8%) had sick leave due to coronavirus or corona-like symptoms. Nurses and then nursing aid workers constituted the categories with more frequency of sick leave. The more median days of sick leave were observed among supervisors and midwives. About 80% of participants had typical symptoms of Coronavirus. In conclusion, the median days of sick leave due to coronavirus were not as high as we thought. This could be due to human resource shortage and insufficient knowledge regarding return-to-work guidelines in the early phase of this pandemic. https://acta.tums.ac.ir/index.php/acta/article/view/9082