Table 2 Seroprevalence of WNV infection and possibly other flavivirus in wild birds admitted to the WRC across Portugal
From: Serological evidence of antibodies to Flaviviridae in wild birds in Portugal
Variable | Number (%) tested | Number (%) of seropositive | 95% CI |
|---|---|---|---|
Rehabilitation center | |||
 CERAS | 21 (10.1) | 7 (33.3) | 14.6–57.0 |
 CERVAS | 1 (0.5) | 0 (0.0) | 0.0–97.5 |
 CIARA | 3 (1.4) | 0 (0.0) | 0.0–70.7 |
 CRAS-HVUTAD | 182 (87.5) | 35 (19.2) | 13.8–25.7 |
 RIAS | 1 (0.5) | 0 (0.0) | 0.0–97.5 |
|  |  | p = 0.362 |  |
Order | |||
 Accipitriformes | 105 (50.5) | 28 (26.7) | 18.5–36.2 |
 Ciconiiformes | 21 (10.1) | 2 (9.5) | 0.0–30.4 |
 Falconiformes | 10 (4.8) | 0 (0.0) | 0.0–30.9 |
 Passeriformes | 12 (5.8) | 0 (0.0) | 0.0–26.5 |
 Strigiformes | 45 (21.6) | 12 (26.7) | 14.6–42.0 |
 Othera |  |  |  |
|  |  | p < 0.001 |  |
Age | |||
 Juvenile | 54 (26.0) | 5 (9.3) | 0.0–20.3 |
 Adult | 28 (13.5) | 9 (32.1) | 15.9–52.4 |
 Undeterminedb | 126 (60.6) | 28 (22.2) | 15.3–30.5 |
|  |  | p = 0.014 |  |
Geographical region | |||
 North | 133 (63.9) | 26 (19.5) | 13.2–27.3 |
 Centre | 21 (10.1) | 6 (28.6) | 11.3–52.2 |
 Lisbon Metropolitan Area | 1 (0.5) | 0 (0.0) | 0.0–97.5 |
 Alentejo | 9 (4.3) | 2 (22.2) | 0.0–60.0 |
 Unknownb | 44 (21.2) | 8 (18.2) | 0.0–32.7 |
|  |  | p = 0.725 |  |
Sex | |||
 Female | 21 (10.1) | 1 (4.8) | 0.0–23.8 |
 Male | 32 (15.4) | 11 (34.4) | 18.6–53.2 |
 Undeterminedb | 155 (74.5) | 30 (19.4) | 13.5–26.5 |
|  |  | p = 0.017 |  |
Migratory behavior | |||
 Resident | 158 (76.0) | 31 (19.6) | 13.7–26.7 |
 Migratory | 27 (13.0) | 8 (29.6) | 13.8–50.2 |
 Mixed | 23 (11.1) | 3 (13.0) | 0.0–33.6 |
|  |  | p = 0.334 |  |
TOTAL | 208 (100) | 42 (20.2) | 15.0–26.3 |