Volume 24, Number 7—July 2018
Research
Avian Influenza A Virus Infection among Workers at Live Poultry Markets, China, 2013–2016
Table 4
Seroincidence of influenza A(H7N9), A(H9N2), and A(H5N1) viruses in in poultry workers, swine workers, and controls, eastern China, 2013–2016*
Antigen, participant category | Person-years | No. seroconversions | Incidence (95% CI) | IRR (95% CI) |
---|---|---|---|---|
H7N9 | ||||
Poultry workers | 1,569 | 2 | 1.27 (0.15–4.60) | 3.30 (0.17–194.48) |
Swine workers | 1,558 | 0 | 0 (0–2.36) | 1.66 (0–64.73) |
Controls |
2,586 |
1 |
0.39 (0.01–2.15) |
Reference |
H9N2 | ||||
Poultry workers | 1,569 | 13 | 8.28 (4.42–14.12) | 5.36 (1.65–22.55) |
Swine workers | 1,558 | 3 | 1.93 (0.40–5.61) | 1.24 (0.18–7.36) |
Controls |
2,586 |
4 |
1.54 (0.42–3.96) |
Reference |
H5N1 | ||||
Poultry workers | 1,569 | 7 | 4.46 (1.80–9.17) | NA |
Swine workers | 1,558 | 0 | 0 (0–2.36) | NA |
Controls | 2,586 | 0 | 0 (0–1.43) | Reference |
*Incidence is per 1,000 person-years. IRR, incidence rate ratio; NA, statistics not performed because of 0 in 2 groups.
1These authors contributed equally to this article.