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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)

From: Targeted surveillance reveals native and invasive mosquito species infected with Usutu virus

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
  1. aThe number of gravid individuals from each trap is listed in parentheses following the total number
  2. bUsutu virus nucleic acid was detected in two pools of Cx. pipiens/Cx. torrentium with 7 and 15 individuals, respectively
  3. cUsutu virus nucleic acid was detected in one pool of six Ae. j. japonicus which was determined to be a disseminated infection
  4. dUsutu virus nucleic acid was detected in 14 of 16 pools of Cx. pipiens/Cx. torrentium each containing between 7 and 25 individuals