Volume 18, Number 12—December 2012
Research
Outbreak of Influenza A (H3N2) Variant Virus Infection among Attendees of an Agricultural Fair, Pennsylvania, USA, 2011
Table 4
Characteristics of Club X cohort members, by case status, who attended agricultural Fair A during an outbreak of A(H3N2)v virus infection, Pennsylvania, 2011*
Characteristic | No. members, N = 127 | No. (%) suspected cases | RR† (95% CI) |
---|---|---|---|
Sex | |||
M |
47 | 5 (11) | |
F |
80 | 9 (11) | |
Age, y | |||
<4 |
2 | 0 (0) | |
4–13 |
70 | 7 (10) | |
14–18 |
51 | 7 (14) | |
>19 |
4 | 0 (0) | |
Underlying medical condition | |||
No |
105 | 14 (13) | |
Yes |
19 | 0 (0) | |
Swine exposure‡ | |||
None |
27 | 1 (4) | Referent |
Indirect |
39 | 3 (8) | 2.1 (0.2–53.4) |
Direct |
61 | 10 (16) | 4.4 (0.8–116.3) |
Exhibited swine | |||
No |
91 | 10 (11) | |
Yes |
34 | 4 (12) | 1.1 (0.2–3.2) |
Family owns swine | |||
No |
92 | 7 (8) | |
Yes |
33 | 7 (21) | 2.8 (0.9–8.6) |
Fed swine | |||
No |
78 | 7 (9) | |
Yes |
37 | 7 (19) | 2.1 (0.7–6.6) |
Bathed swine | |||
No |
80 | 7 (9) | |
Yes |
35 | 7 (20) | 2.3 (0.7–7.1) |
Cleaned swine pen | |||
No |
84 | 7 (8) | |
Yes |
31 | 7 (23) | 2.7 (0.8–8.3) |
*Club X is an agricultural club for children. A(H3N2)v, influenza A (H3N2) variant virus. RR, relative risk.
†RR of suspected case status is reported for selected exposures.
‡Direct exposure defined as touching pigs; Indirect exposure defined as attending or walking near the pig exhibit.