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Table 1 COVID-19 surveillance scenarios

From: Cost-effectiveness analysis on COVID-19 surveillance strategy of large-scale sports competition

Scenario

Frequency of NAT monitoring (the competition-related personnel)

Frequency of additional NAT monitoring (the national sports delegation with the quarantined infection)a

1

Every 7 days

–

2

Every 6 days

–

3

Every 5 days

–

4

Every 4 days

–

5

Every 3 days

–

6

Every 2 days

–

7

Once a day

–

8

Twice a day

–

9

Three times a day

–

10

Every 7 days

Once a day (Quarantine the infection)

11

Every 6 days

Once a day (Quarantine the infection)

12

Every 5 days

Once a day (Quarantine the infection)

13

Every 4 days

Once a day (Quarantine the infection)

14

Every 3 days

Once a day (Quarantine the infection)

15

Every 2 days

Once a day (Quarantine the infection)

16

Once a day

Once a dayb (Quarantine the infection)

17

Twice a day

Once a day (Quarantine the infection)

18

Three times a day

Once a day (Quarantine the infection)

  1. aThe competition-related personnel came from different national sports delegations. When an infection was found in the health monitoring, we would strengthen close-contact control, that was, we would increase the NAT frequency for people from the same national sports delegation for 14 days. bWhen an infection was found, the infection was quarantined and the national sports delegation with the quarantined infection accepted NAT twice a day for 14 days. At the same time, other national sports delegations without the quarantined infection accepted NAT once a day