Table 1 Use of alternative entry screening approaches and intervals between official confirmation of first imported pandemic influenza A (H1N1) case and official confirmation of first untraceable local case for 26 nations with more than 100 confirmed cases by July 6, 2009.
From: Entry screening to delay local transmission of 2009 pandemic influenza A (H1N1)
Screening approaches used | n (%) | Median interval, days (inter-quartile range) | Mean interval, days | Mean difference in intervals compared to no screening (95% CI)* |
|---|---|---|---|---|
No screening | 5 (19%) | 22 (0, 22) | 14 | Â |
1- Medical checks before disembarkation | 2 (8%) | 21 (14, 28) | 21 | 7 (-14, 30) |
2- Health declaration forms | 11 (42%) | 22 (13, 34) | 23 | 9 (-4, 24) |
3- Symptom screening | 13 (50%) | 33 (7, 41) | 26 | 12 (-2, 27) |
4- Thermal scanners | 13 (50%) | 22 (7, 33) | 21 | 7 (-6, 23) |
2 OR 3 OR 4 | 21 (81%) | 22 (7, 35) | 23 | 9 (-3, 22) |
2 AND 3 AND 4 | 6 (23%) | 23 (9, 35) | 22 | 7 (-9, 25) |