Table 1.
Characteristics of the tested cats for three influenza viruses and the seroprevalence of the sera against these influenza viruses
| Characteristic | No. (%) samples a | No. (%) positive | ||
|---|---|---|---|---|
| H1N1/09 b | Canine H3N2 c | Human H3N2 d | ||
| Age (year) | ||||
| ≤2 | 455 (25.4%) | 12 (2.6%) | 2 (0.4%) | 1 (0.2%) |
| 3-6 | 463 (25.8%) | 13 (2.8%) | 4 (0.9%) | 3 (0.6%) |
| 7-9 | 334 (18.6%) | 21 (6.3%) | 2 (0.6%) | 2 (0.6%) |
| ≥10 | 542 (30.2%) | 56 (10.3%) | 4 (0.7%) | 2 (0.4%) |
| P e < 0.001 | P = 0.876 | P = 0.754 | ||
| Sex | ||||
| Male | 1028 (57.3%) | 53 (5.2%) | 5 (0.5%) | 4 (0.4%) |
| Female | 766 (42.7%) | 49 (6.4%) | 7 (0.9%) | 4 (0.5%) |
| P = 0.261 | P = 0.272 | P = 0.676 | ||
| Season | ||||
| Spring (Mar–May) | 578 (32.2%) | 39 (6.7%) | 2 (0.3%) | 1 (0.2%) |
| Summer (Jun–Aug) | 352 (19.6%) | 15 (4.3%) | 3 (0.9%) | 1 (0.3%) |
| Autumn (Sep–Nov) | 446 (24.9%) | 22 (4.9%) | 4 (0.9%) | 4 (0.9%) |
| Winter (Dec–Feb) | 418 (23.3%) | 26 (6.2%) | 3 (0.7%) | 2 (0.5%) |
| P = 0.356 | P = 0.694 | P = 0.357 | ||
aHI positive samples were analyzed. bH1N1/09 is A/Beijing/7/2009 (H1N1). cCanine H3N2 is A/canine/Beijing/359/2009 (H3N2). dHuman H3N2 is A/Beijing/126/2012 (H3N2). ePearson’s χ2 test was used to compare the differences between groups.