In order to better assist in the investigation of key risk groups involved in the epidemic, guide the masses to independently report the contact history of confirmed cases and the living history of epidemic-related risk areas, timely investigate risks, control risks as soon as possible, and effectively prevent the spread of the epidemic.
Two-dimensional code refers to another readable bar code based on one-dimensional bar code, which represents binary data with black and white rectangular patterns, and the information contained in it can be obtained after scanning by equipment.