Page 143 - Timeliness of Infectious Disease Notification & Response Systems - Corien Swaan

Timeliness of contact tracing among flight passengers 141
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Table 1. Overview of 17 contact investigations (n.a.: information on these dates was not available)
Nr Flight a rrival date
Dutch (DA) Origin / foreign
airline (FA)
PLCa First date used of illness
Date of diagno- sis
Date request CT
Date contacts identified
Interval I: flight arrival - diagnosis
Interval II: diagnosis - request CT
Interval III: re- Total Delay quest CT con- (I + II + III) tact identified
(95%CI)
Schiphol
1 27-4-09
2 30-4-09
3 6-5-09
4 6-5-09
5 14-5-09
6 21-5-09
7 29-5-09
8 29-5-09
9 2-6-09
10 8-6-09
11 13-6-09
12 18-6-09
13 14-6-09
14 9-6-09
15 14-6-09
16 14-6-09
17 18-6-09
Mean
DA DA DA DA FA DA DA DA DA DA DA DA DA FA DA DA DA
Cancun Cancun Mex city Mex city Detroit NewYork Houston Houston NewYork Toronto NewYork Cancun Miami Boston Cancun Cancun Miami
No No Yes Yes No No No No No No No Yes No No Yes Yes No
27–4
30–4
4–5
6–5
12–5
22–5
29–5
29–4 6–5 7–5 11–5 n.a. n.a. n.a. 3–6 3–6 n.a. 15–6 19–6 16–6 11–6 16–6 17–6 20–6
29–4
7–5
8–5
12–5
16–5
25–5
2–6
4–6
4–6
10–6
16–6
19–6
17–6
12–6
17–6
18–6
20–6
30–4
7–5
8–5
12–5
16–5
26–5
2–6
4–6
5–6
11–6
16–6
20–6
18–6
13–6
17–6
19–6
23–6
2
6
1
5
***
***
***
5
0 1*
1 3
0 7
0 2
0 6
0 2
1 5
0 4
0 6
1 3
1 3
0 3
1 2
1 4
1 4
0 3
1 5
2 5
n.a. 2–6 2–6 13–6 13–6 13–6 7–6 11–6 14–6 18–6
1** 1
* : . In the beginning of the pandemic one request for contact tracing was accepted after 7 days
**: these late CT requests were accepted as the passenger lists of the concerned flights already were available from earlier contact investigations
***: date of diagnosis not known
a: Passenger Locator Card
1 1**
1
***
2
1
2
2
2
3
2
2.6 0.8 0.6 3.9 (1.6–3.6) (0.6–1.1) (0.3–0.9) (3.2–4.7)
1 0 1 1 1 1 1