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Table 1 Overview of 17 contact investigations (n.a.: information on these dates was not available)

From: Timeliness of contact tracing among flight passengers for influenza A/H1N1 2009

Nr Flight arrival date Schiphol Dutch (DA)/foreign airline (FA) Origin PLCª
used
First date of illness Date of diagnosis Date request CT Date contacts identified Interval I: flight arrival - diagnosis Interval II: diagnosis - request CT Interval III: request CT - contact identified Total Delay (I + II + III)
1 27-4-09 DA Cancun No 27-4 29-4 29-4 30-4 2 0 1 3
2 30-4-09 DA Cancun No 30-4 6-5 7-5 7-5 6 1* 0 7
3 6-5-09 DA Mex city Yes 4-5 7-5 8-5 8-5 1 1 0 2
4 6-5-09 DA Mex city Yes 6-5 11-5 12-5 12-5 5 1** 0 6
5 14-5-09 FA Detroit No 12-5 n.a. 16-5 16-5 ***   0 2
6 21-5-09 DA NewYork No 22-5 n.a. 25-5 26-5 ***   1 5
7 29-5-09 DA Houston No 29-5 n.a. 2-6 2-6 ***   0 4
8 29-5-09 DA Houston No n.a. 3-6 4-6 4-6 5 1** 0 6
9 2-6-09 DA NewYork No 2-6 3-6 4-6 5-6 1 1 1 3
10 8-6-09 DA Toronto No 2-6 n.a. 10-6 11-6 ***   1 3
11 13-6-09 DA NewYork No 13-6 15-6 16-6 16-6 2 1 0 3
12 18-6-09 DA Cancun Yes 13-6 19-6 19-6 20-6 1 0 1 2
13 14-6-09 DA Miami No 13-6 16-6 17-6 18-6 2 1 1 4
14 9-6-09 FA Boston No 7-6 11-6 12-6 13-6 2 1 1 4
15 14-6-09 DA Cancun Yes 11-6 16-6 17-6 17-6 2 1 0 3
16 14-6-09 DA Cancun Yes 14-6 17-6 18-6 19-6 3 1 1 5
17 18-6-09 DA Miami No 18-6 20-6 20-6 23-6 2 1 2 5
Mean (95%CI)          2,6
(1,6-3,6)
0,8
(0,6-1,1)
0,6
(0,3-0,9)
3,9
(3,2-4,7)
  1. *:. In the beginning of the pandemic one request for contact tracing was accepted after 7 days
  2. **: these late CT requests were accepted as the passenger lists of the concerned flights already were available from earlier contact investigations
  3. ***: date of diagnosis not known
  4. ª: Passenger Locator Card