How to cancel the key population of Harbin epidemic

You can cancel it after it turns cloudy.

According to the epidemic prevention policy of Harbin, the key population can be cancelled after turning negative.

The key population refers to people with high exposure risk, high transmission risk and low resistance in COVID-19, including medical personnel, front-line personnel of entry-exit, customs and market supervision system, police, security guards, sanitation workers, cleaners, transportation practitioners, couriers, public service personnel, water and electricity workers, the elderly, patients with chronic basic diseases, pregnant women, children and the disabled.