Volume 25, Number 3—March 2019
Dispatch
Role of Backyard Flocks in Transmission Dynamics of Highly Pathogenic Avian Influenza A(H5N8) Clade 2.3.4.4, France, 2016–2017
Table 1
Results of serologic assays for 70 backyard flocks and 608 birds, by bird species comprising the flock, Gers Department, France, 2016–2017
| Species comprising flock | Avian influenza virus |
Influenza A virus subtype H5 |
|||||
|---|---|---|---|---|---|---|---|
| Positive | Total | Seroprevalence, % (95% CI) | Positive | Total | Seroprevalence, % (95% CI) | ||
| All backyard holdings | 18 | 70 | 25.7 (16.9–37.0) | 8 | 70 | 11.4 (5.9–21.0) | |
| Backyard holdings with only chickens | 9 | 48 | 18.8 (10.2–31.9) | 2 | 48 | 4.2 (1.2–14.0) | |
| Backyard flocks with ducks | 9 | 22 | 40.9 (23.3–61.3) | 6 | 22 | 27.3 (13.2–48.2) | |
| All birds | 36 | 608 | 5.9 (4.3–8.1) | 20 | 608 | 3.3 (2.1–5.0) | |
| Chickens | 20 | 486 | 4.1 (2.7–6.3) | 9 | 486 | 1.9 (1.0–3.5) | |
| Ducks | 16 | 122 | 13.1 (8.2–20.2) | 11 | 122 | 9.0 (5.1–15.4) | |
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Page updated: February 19, 2019
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