Table 5. Seroprevalence of antibodies against influenza A virus subtypes H5N1, H5N8, H9N2, H1N1, and H3N2 in participants in a study of avian influenza among backyard poultry growers, Egypt, August 2015–March 2019.
| Period and influenza virus subtype |
No. (%) |
|---|---|
| Baseline period, August 2015–March 2017 | |
| H5N1 positive | 9 (0.4) |
| H5N1 negative | 2,388 (99.6) |
| H5N8 positive | 0 |
| H5N8 negative | 2,397 (100.0) |
| H9N2 positive | 266 (11.1) |
| H9N2 negative | 2,131 (88.9) |
| H1N1 positive | 656 (29.5) |
| H1N1 negative | 1,569 (70.5) |
| H3N2 positive | 1,115 (49.3) |
| H3N2 negative |
1,148 (50.7) |
| Follow-up period 1, April 2017–March 2018 | |
| H5N1 positive | 4 (0.2) |
| H5N1 negative | 2,046 (99.8) |
| H5N8 positive | 0 |
| H5N8 negative | 2,046 (100.0) |
| H9N2 positive | 3 (0.1) |
| H9N2 negative | 2,043 (99.9) |
| H1N1 positive | 612 (29.8) |
| H1N1 negative | 1,439 (70.2) |
| H3N2 positive | 1,034 (50.5) |
| H3N2 negative | 1,015 (49.5) |
*Totals do not add up to 2,402 at baseline period or 2,189 at follow-up period 1 because of missed serum sample collection or insufficient sample volume.