Table 2 Impact of clearance testing on contact tracing and quarantine strategies for a community of 1000 people
Strategy | No clearance testing | Clearance testing undertaken | ||||
|---|---|---|---|---|---|---|
Total cumulative infections | Quarantine person-days (first year) | Total tests performed during outbreak (first year) | Total cumulative infections | Quarantine person-days (first year) | Total tests performed during outbreak (first year) | |
No response | 999 (999–999) | N/A | 447.0 (435.5, 458.0) | 999 | N/A | N/A |
Quarantine of immediate household contacts (with case isolation) | 922.0 (907.5, 936.5) | 29,595.5 (28,101.5–31,175.0) | 1957.5 (1867–2027) | 922.5 (905.0, 933.0) | 22,500.5 (21,469.0–23,306.0) | 7526.0 (7336–7743) |
Quarantine of extended i.e. all household contacts (with case isolation) | 831.5 (751.0, 871.0) | 86,825.0 (70,334.5–97,662.5) | 4042.5 (3463–4305) | 655.0 (267.5, 821.0) | 50,958.0 (13,511.5, 67,786.0) | 13,551.5 (4929.5, 16,729.5) |
Quarantine of close contacts based on history (past 2 days) | 937.0 (929.0, 945.0) | 10,776.5 (9551.5–11,564.5) | 1530.5 (1441–1586) | 930.5 (917.0, 939.5) | 9445.5 (8541.5, 10,191.5) | 4673.5 (4549.5, 4780.5) |
Quarantine of all contacts based on history (past 2 days) | 930.0 (917.0, 941.0) | 11,887.0 (11,180.0–12,831.5) | 1614.5 (1550–1667) | 919.0 (904.5, 931.5) | 10,662.0 (9718.0, 11,768.5) | 4842.5 (4741.0, 4957.0) |