As the coronavirus disease 2019 (COVID-19) pandemic, caused by severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), continues to rage, disclosure of exposure to the virus is of great significance to safety management, especially considering the long latency of the disease. We conducted a survey based on terror management theory of 2,542 people in 71 cities, representing all provinces in mainland China. The results revealed that fear of being isolated influenced disclosure of exposure to the virus and that this influence was mediated by defensive impression management motivation. An inclusive climate buffered both the direct and the indirect effects of fear of isolation on disclosure behaviour via defensive impression management motivation. The implications of these findings for research and safety management during the COVID-19 pandemic are discussed.