Table 6.

Summary of contact tracing investigations of flights

Sources	Case	Flights boarded	Identified contacts	Contacts reached (%)	Contacts followed 14 days (%)	Contacts that developed symptoms	Contacts tested	Positive contacts
EWRS 23 September 2012 [41], Bermingham [42], Pebody [43], DON 23 September 2012 [44]	1	1	.	.	.	.	.	.
EWRS 23 November 2012 [41], Buchholz [45]	2	1	.	.	.	.	.	.
EWRS 23 November 2012 [41], Reuss [46], DON 26 March 2013 [47]	3	1	.	.	.	.	.	.
EWRS 8 February 2013 [41], HPA[48], DON 11 February 2013 [49]	4	1	20	11 (55)	11 (55)	2	1	0
EWRS 31 May 2013 [41], Puzelli[50], DON 1 June 2013 [51]	5	2	9	9 (100)	9 (100)	0	.	.
EWRS 18 April 2014 [41], Tsiodras[52], DON 20 April 2014 [53]	6	2	12	.	.	.	.	.
EWRS 2 May 2014 [41], Bialek [54], Parry-Ford [39], Regan [55], Lippold [56], DON 5 May 2014[57]	7	2	269	144 (53)*	42 (15)	16	3	0
EWRS 2 May 2014 [41], Bialek [54], Parry-Ford [39], Regan [55], Lippold [56], DON 14 May 2014[58]	8	4	561	450 (80)*	3 (0.5)	35	230	0
EWRS 14 May 2014 [41], Kraaij [59], Mollers [60], DON 15 May 2014 [61]	9	2	17	17 (100)	17 (100)	2	17	0
EWRS 14 May 2014 [41], Kraaij [59], Mollers [60], DON 16 May 2014 [62]	10	2	17	17 (100)	17 (100)	2	17	0
EWRS 30 September 2014 [41], Kwok-ming [63], DON 2 October 2014 [64]	11	2	43	43 (100)	43 (100)	1	1	0
DON 24 October 2014 [65]	12	1	.	.	.	.	.	.
Racelis[66], DON 13 February 2015 [67]	13	1	237	85 (35)	.	0	85	0
Wu [68], Kang[69], DON 30 May 2015 [70]	14	1	27	27 (100)	6 (22)	0	6	0
Plipat [71], DON 20 June 2015 [72]	15	1	89	89 (100)	26 (29)	0	14	0
DON 26 January 2016 [73]	16	1	.	.	.	.	.	.
DON 29 January 2016 [74]	17	1	.	.	.	.	.	.
DON 26 August 2016 [75]	18	1	.	.	.	.	.	.
DON 8 January 2018 [76]	19	1	.	.	.	.	.	.
EWRS 23 August 2018 [41], DON 31 August 2018 [77]	20	1	18	17 (94)	.	.	.	.
DON 12 September 2018 [78]	21	2	.	.	.	.	.	.
		Total	1319	909	174	58	374	0
		Mean	109.92	82.64	19.33	5.8	41.5	0
*Includes people who rejected interview		Median	24	27	17	2	14	0