On March 5, Donggang City, Dandong, Liaoning Province received a letter of assistance for investigation. There was a close contact in Qianyang Town, Donggang City, who was the same passenger of the confirmed case in Jilin Province. In the early morning of March 6, those who were initially screened as positive for infection by “double test and double test” were reviewed by Dandong Center for Disease Control and prevention and determined as asymptomatic infected by experts. Qianyang town has implemented the control measures of “only entering but not leaving, no people leaving the area and no gathering”. All shops in the town have been suspended and all activities have been suspended. In order to effectively block the spread of risk sources and effectively protect people’s life safety and health, the office of epidemic prevention and control headquarters of Donggang City, Dandong, Liaoning Province, issued the following notice on relevant requirements on March 6: