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

Parasites & Vectors

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 (gravid^a)	GT (gravid^a)	USUV+ /pools tested
Linz	Aedes j. japonicus	7	5 (0)	2 (0)	0/1
Linz	Culex pipiens/Cx. torrentium	37	7 (3)	30 (15)	2/3^b
Graz	Ae. j. japonicus	17	10 (0)	7 (2)	1/3^c
	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)	14/16^d
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

ISSN: 1756-3305