Volume 25, Number 12—December 2019
Research
Avian Influenza A Viruses among Occupationally Exposed Populations, China, 2014–2016
Table 5
Risk analysis for seropositive participants in surveys for avian influenza subtypes among poultry workers, China, 2014–2016*
Subtypes and variables | Seropositive, no. (%) | Seronegative, no. (%) | p value† | OR (95% CI) | Adjusted OR (95% CI) |
|
---|---|---|---|---|---|---|
H5Nx‡ | ||||||
Age, y | ||||||
<35 | 8 (10.8) | 442 (21.7) | <0.001 | Referent | Referent | |
35–55 | 40 (54.1) | 1,231 (60.4) | 1.8 (0.8–3.9) | 2.3 (1.0–4.9) | ||
>55 | 26 (35.1) | 366 (18.0) | 3.9 (1.8–8.8) | 4.7 (2.1–10.7) | ||
Exposed to ducks | ||||||
Yes | 34 (45.3) | 651 (31.8) | 0.014 | 1.8 (1.1–2.8) | 1.6 (1.0–2.5) | |
No | 41 (54.7) | 1,398 (68.2) | Referent | Referent | ||
Exposed to ill or dead poultry | ||||||
Yes | 15 (20.0) | 221 (10.8) | 0.013 | 2.1 (1.2–3.7) | 2.3 (1.3–4.2) | |
No | 60 (80.0) | 1826 (89.2) | Referent | Referent | ||
Seropositivity for H1N1(pdm09) virus | ||||||
Positive | 24 (32.0) | 316 (16.4) | <0.001 | 2.6 (1.6–4.3) | 3.1 (1.8–4.5) | |
Negative |
51 (68.0) |
1,733 (84.6) |
Referent |
Referent |
||
H7N9 | ||||||
Sex | ||||||
F | 53 (64.6) | 924 (45.2) | <0.001 | 2.2 (1.4–3.5) | 2.2 (1.4–3.6) | |
M | 29 (35.4) | 1,118 (54.8) | Referent | Referent | ||
Poultry seller§ | ||||||
Yes | 70 (85.4) | 1,173 (57.5) | <0.001 | 4.3 (2.3–8.0) | 4.1 (2.2–7.7) | |
No | 12 (14.6) | 867 (42.5) | Referent | Referent | ||
No. years of work at live poultry market | ||||||
<3 | 11 (13.4) | 561 (27.5) | 0.017 | Referent | Referent | |
3–10 | 46 (56.1) | 924 (45.3) | 2.0 (1.1–3.5) | 1.8 (1.0–3.2) | ||
>10 | 25 (30.5) | 557 (27.3) | 1.7 (0.9–3.2) | 1.3 (0.7–2.5) | ||
Seropositivity for seasonal H3N2 virus | ||||||
Positive | 44 (53.7) | 743 (36.4) | 0.002 | 2.0 (1.3–3.2) | 1.9 (1.2–2.9) | |
Negative |
38 (46.4) |
1,299 (63.6) |
Referent |
Referent |
||
H9N2 | ||||||
Age, y§ | ||||||
<35 | 56 (23.6) | 394 (21.0) | 0.004 | 2.1 (1.3–3.4) | 1.9 (1.1–3.3) | |
35–55 | 156 (65.8) | 1,115 (59.4) | 2.1 (1.3–3.2) | 1.6 (1.0–2.5) | ||
>55 | 25 (10.6) | 367 (19.6) | Referent | Referent | ||
Sex | ||||||
F | 134 (56.5) | 843 (44.7) | <0.001 | 1.6 (1.2–2.1) | 1.6 (1.2–2.1) | |
M | 103 (43.5) | 1,044 (55.3) | Referent | Referent | ||
Poultry seller§ | ||||||
Yes | 175 (73.8) | 1,068 (56.7) | <0.001 | 2.2 (1.6–2.9) | 1.9 (1.4–2.6) | |
No | 62 (26.2) | 817 (43.3) | Referent | Referent | ||
Poultry processor§ | ||||||
Yes | 67 (28.3) | 407 (21.6) | 0.02 | 1.4 (1.1–1.9) | 1.3 (1.0–1.7) | |
No | 170 (71.7) | 1,478 (78.4) | Referent | Referent | ||
No. years of work at live poultry market | ||||||
<3 | 37 (15.6) | 535 (28.4) | <0.001 | Referent | Referent | |
3–10 | 126 (53.2) | 844 (44.7) | 2.6 (1.8–3.7) | 2.4 (1.6–3.5) | ||
>10 |
74 (31.2) |
508 (26.9) |
2.2 (1.5–3.2) |
3.0 (1.3–3.1) |
||
H6N1 | ||||||
Seropositivity for H1N1(pdm09) virus | ||||||
Positive | 19 (35.9) | 321 (15.5) | <0.001 | 3.0 (1.7–5.4) | 3.0 (1.7–5.4) | |
Negative | 34 (64.1) | 1,750 (84.5) | Referent | Referent | ||
Seropositivity for H9N2 virus | ||||||
Positive | 13 (24.5) | 224 (10.8) | 0.002 | 2.7 (1.4–5.1) | 2.6 (1.4–5.0) | |
Negative | 40 (75.5) | 1,847 (89.2) | Referent | Referent |
*Results represent only statistically significant factors from analysis of questionnaire data.
†By χ2 test.
‡Combined the H5N1-SC29 and H5N6 data.
§Missing data.
1These authors contributed equally to this article.