Table. Selected characteristics of persons with confirmed cases of influenza A(H1N1)pdm09 virus infection, United Kingdom, April 2009* .
| 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.