Volume 20, Number 1—January 2014
Contact Tracing for Influenza A(H1N1)pdm09 Virus–infected Passenger on International Flight
|Case-patient no.||Symptomatic during flight||No. rows from index case-patient||Day of symptom onset, April 2009, no. days before/after flight|
|1†||Yes||18th, 3 before|
|2‡||No||Same||23rd, 2 after|
|3||No||2 behind||24th, 3 after|
|4||No||4 in front||26th, 5 after|
|5||No||4 in front||24th, 3 after|
|6||No||5 behind||22nd, 1 after|
|7||No||8 behind||24th, 3 after|
|8§||NA||NA||25th, 4 after|
|9¶||NA||NA||26th, 5 after|
*Characteristics were determined during flight-related contact tracing. NA, not applicable.
†Case-patient 1, the index patient, had the first laboratory-confirmed case of A(H1N1)pdm09 infection in the United Kingdom.
‡Case-patient 2 was the traveling companion of case-patient 1.
§Case-patient 8 was not on the flight and is a secondary case-patient who is believed to have been exposed to the virus by case-patient 2.
¶Case-patient 9 was not on the flight and is believed to have been exposed to the virus by a passenger who was on the flight but who had test results negative for A(H1N1)pdm09 virus.