Volume 18, Number 12—December 2012
Outbreak of Influenza A (H3N2) Variant Virus Infection among Attendees of an Agricultural Fair, Pennsylvania, USA, 2011
|Case-patient no., case status||Age group, y/sex||Underlying condition||Date(s) at fair†||Date of illness onset‡||Symptoms||Clinical outcome|
|1, confirmed||<4/F||No||3||7||Fever, cough, runny nose||Visited clinic, recovered|
|2, confirmed||4–13/F||No||0 to 7||11||Feverish, vomiting, abdominal pain||Did not seek medical care, recovered|
|3, confirmed||4–13/F||Yes||2 to 5||5||Fever, cough, dyspnea, vomiting, diarrhea||Hospitalized, ICU (not mechanically ventilated), recovered|
|4, probable||<4/M||No||4||6||Fever, cough, runny nose, diarrhea||Visited clinic, recovered|
|5, probable||<4/F||No||0 to 3, 5, 6||5||Fever, cough||Did not seek medical care, recovered|
|6, probable||<4/M||No||6||12||Fever, cough, sore throat, runny nose||Did not seek medical care, recovered|
|7, probable||<4/F||No||−1§ to 2, 4, 5, 7||4||Feverish, cough||Did not seek medical care, recovered|
*Case-patients 1–7 visited the swine exhibit, and all except case-patient 4 also touched swine. Case-patient 2 exhibited swine with an agricultural club for children (Club X) and was not randomly selected for the cohort study. A(H3N2)v, influenza A (H3N2) variant virus; ICU, intensive care unit.
†Day 0 is the first day fair was open to the public.
‡Illness onset date represents number of days after fair was open to the public.
§Arrived at fairgrounds 1 day before fair was open to the public.