Ariapooran S, et al. - During the outbreak of the COVID-19, nurses tend to experience a lot of secondary traumatic stress (STS). Researchers herein investigated the prevalence of STS and compared nurses with and without STS symptoms with respect to depression, anxiety, and suicidal ideation (SI) during the COVID-19 outbreak. Assessing the statistical sample consisting of 315 nurses working in hospitals of Malayer city, western Iran, they identified STS prevalence of 51.11% in nurses during the COVID-19 outbreak. Risk for STS was noted to be high among single nurses and nurses with a BA degree. Nurses in ICU-CCU had higher mean STS relative to nurses in other wards. Relative to nurses without STS symptoms, nurses with STS symptoms recorded higher levels of depression, anxiety, and SI. Considering the results, researchers herein underscore the role of psychiatric nurses in recognizing the problem, and providing counseling and supportive care for nurses involved in COVID-19 related wards.