1. At present, the task of epidemic prevention and control in CDC is arduous, and most of the staff have been transferred to many posts such as flow regulation, disinfection, nucleic acid detection and card point duty. Almost everyone is on duty, and sometimes no one answers.

2. The staff didn't answer when they were on duty to eat or go to the toilet for a short time.

You can supervise by checking whether the telephone number is correct or not, and leaving a message in official website.