Is it serious to receive streaming media messages in Lanzhou?

Just cooperate with the investigation. Epidemiological investigation (hereinafter referred to as epidemiological investigation) refers to the investigation and study conducted by epidemiological methods. It is mainly used to study the distribution and determinants of diseases, health and hygiene events. Through these studies, reasonable preventive health care countermeasures and health service measures are put forward, and the effects of these countermeasures and measures are evaluated.