Table 1.
Adult female mosquitoes collected from sites of Usutu virus-positive Eurasian blackbird deaths in Austria, 2018. Mosquitoes were collected overnight (Linz, one trap-night; Graz, two trap-nights) with a CDC miniature light trap baited with CO2 (LT) or a gravid trap containing hay infusion (GT)
| Location | Species | Total | LT (gravida) | GT (gravida) | USUV+ /pools tested |
|---|---|---|---|---|---|
| Linz | Aedes j. japonicus | 7 | 5 (0) | 2 (0) | 0/1 |
| Culex pipiens/Cx. torrentium | 37 | 7 (3) | 30 (15) | 2/3b | |
| Graz | Ae. j. japonicus | 17 | 10 (0) | 7 (2) | 1/3c |
| Ae. vexans | 3 | 3 (0) | 0 (0) | 0/1 | |
| Anopheles maculipennis | 1 | 1 (0) | 0 (0) | 0/1 | |
| Cx. pipiens/Cx. torrentium | 315 | 8 (2) | 307 (275) | 14/16d | |
| Total | 380 | 34 (5) | 346 (292) | 17/25 |
aThe number of gravid individuals from each trap is listed in parentheses following the total number
bUsutu virus nucleic acid was detected in two pools of Cx. pipiens/Cx. torrentium with 7 and 15 individuals, respectively
cUsutu virus nucleic acid was detected in one pool of six Ae. j. japonicus which was determined to be a disseminated infection
dUsutu virus nucleic acid was detected in 14 of 16 pools of Cx. pipiens/Cx. torrentium each containing between 7 and 25 individuals