Table 1.

The screening strategies in large-scale screening program.

STRATEGIES	SCREENING OBJECTIVES	SAMPLING APPROACH	TESTING APPROACH	QUARANTINE REQUIREMENT
High-risk population	Close contacts of the index case, such as cohabiting family member, colleague, etc.	Single sampling	Daily nucleic acid test and once serological antibody test	14 days of centralized isolation in designated hotels
Sub-high-risk population	The cohabiting family members of the index case’s close contacts and neighbor in living or working place of the index case	Single sampling	At least 2 times of nucleic acid test and once serological antibody test	7 days in centralized medical observation points + 7 days at home
Community screening population	Residents in screening area, customers have been to the supermarket, etc.	Pooled sampling	Nucleic Acid Test	0
Accessible service	Inconvenient people, such as the elderly and the disabled	Depends	Nucleic Acid Test	0
Environmental sampling	External environment and product samples within screening areas	Single sampling	Nucleic Acid Test	–