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Volume 19, Number 4—April 2013

Dispatch

Tick-borne Encephalitis Virus in Horses, Austria, 2011

James O. Rushton, Sylvie Lecollinet, Zdenek Hubálek, Petra Svobodová, Helga Lussy, and Norbert NowotnyComments to Author 
Author affiliations: University of Veterinary Medicine, Vienna, Austria (J.O. Rushton, H. Lussy, N. Nowotny); Agence Nationale de Sécurité Sanitaire, Maisons-Alfort, France (S. Lecollinet); Academy of Sciences of the Czech Republic, Brno, Czech Republic (Z. Hubálek, P. Svobodová); Sultan Qaboos University, Muscat, Oman (N. Nowotny)

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Table

WNV-, USUV-, and TBEV-specific neutralization assay results obtained in 2 laboratories for 67 horses positive for flaviviruses by ELISA, Austria, 2011*

Horse no. Age, y Sex Location Virus strains and titers
WNV Is98, Laboratory 1 WNV Eg101, Laboratory 2 USUV SAAR 1776, Laboratory 1 TBEV Hypr, Laboratory 1 TBEV Hypr, Laboratory 2
1 3 Stallion Lower Austria <10 <10 <10 100 >40†
2 3 Stallion Lower Austria <10 10 <10 >100‡ >40
3 3 Stallion Lower Austria <10 10–20 <10 >100 >40
4 4 Stallion Lower Austria <10 <20§ <10 >100 >40
5 4 Stallion Lower Austria <10 <20§ <10 >100 >40
6 4 Stallion Lower Austria <10 <10 <10 >100 >40
7 4 Stallion Lower Austria <10 <10 <10 >100 ≥40
8 5 Stallion Lower Austria <10 <20§ <10 >100 >40
9 5 Stallion Lower Austria <10 <10 <10 >100 >40
10 7 Stallion Lower Austria <10 <20§ <10 >100 >40
11 7 Stallion Lower Austria <10 <10 <10 >20¶ >40
12 8 Stallion Lower Austria <30§ <10 <10 >20¶ >40
13 10 Stallion Lower Austria <30§ <10 <30§ >20¶ >40
14 13 Stallion Lower Austria <10 <10 <10 >100 >40
15 1 Stallion Styria <10 <20§ <10 >100 >40
16 1 Stallion Styria <10 <10 <10 20 20
17 1 Mare Styria <10 <10 <10 >100 >40
18 2 Mare Styria <10 10 <10 100 >40
19 2 Stallion Styria 10 <20§ 10 >100 20–40
20 2 Stallion Styria <10 <20§ <10 >100 >40
21 2 Stallion Styria <10 <10 <10 >100 >40
22 2 Stallion Styria <10 <20§ <10 >100 >40
23 2 Stallion Styria <10 <10 <10 >20¶ >40
24 2 Stallion Styria <10 <20§ <10 >100 >40
25 2 Stallion Styria <10 <20§ <10 >100 >40
26 2 Stallion Styria <10 ≤40§ <10 >20¶ ≥40
27 3 Stallion Styria <10 <20§ <10 >100 >40
28 3 Mare Styria <10 10–20 <10 100 >40
29 3 Stallion Styria <10 <20§ <10 >100 >40
30 3 Stallion Styria <10 20 <10 >100 >40
31 3 Stallion Styria <10 <20§ <10 >100 >40
32 3 Mare Styria <10 10 <10 >100 >40
33 3 Stallion Styria <10 <10 <10 >100 >40
34 4 Stallion Styria <10 ≤10§ <10 20 >40
35 4 Mare Styria <10 <10 <10 >100 >40
36 4 Stallion Styria <10 ≤20§ <10 >100 >40
37 4 Mare Styria <10 20 10 >100 >40
38 4 Mare Styria <10 <20§ <10 >100 >40
39 4 Gelding Styria <10 <10 <10 >100 >40
40 4 Stallion Styria <10 <10 <10 >100 >40
41 5 Mare Styria <10 <20§ <10 >100 ≥40
42 5 Mare Styria <10 <10 <10 >30¶ ≥40
43 5 Mare Styria <10 <10 <10 20 20–40
44 6 Mare Styria 10 <2§ 10 100 >40
45 7 Mare Styria 10 <10 10 >20¶ >40
46 7 Mare Styria <10 <10 <10 >100 >40
47 11 Mare Styria <10 <20§ <10 20 >40
48 11 Mare Styria <10 ≤10§ <10 20 >40
49 11 Stallion Styria <10 <20§ <10 100 >40
50 13 Mare Styria <10 <10 <10 >30¶ >40
51 19 Mare Styria <10 <10 <10 >100 >40
52 5 Stallion Vienna <10 <10 <10 >30¶ >40
53 5 Stallion Vienna <10 20 <10 >30¶ >40
54 5 Stallion Vienna <10 <10 <10 >40¶ >40
55 6 Stallion Vienna <10 20 <10 >20¶ >40
56 6 Stallion Vienna <10 <20§ <10 >100 >40
57 6 Stallion Vienna <10 <20§ <10 >100 ≥40
58 7 Stallion Vienna <10 <10 <10 >100 >40
59 7 Stallion Vienna <10 <10 <10 >100 >40
60 9 Stallion Vienna <10 <20§ <10 >100 >40
61 11 Stallion Vienna <10 <20§ <10 >20¶ >40
62 11 Stallion Vienna <10 <20§ <10 >100 >40
63 11 Stallion Vienna <10 10 <10 >100 >40
64 12 Stallion Vienna <10 20 <10 >20¶ >40
65 13 Stallion Vienna <10 <20§ <10 >20¶ >40
66 14 Stallion Vienna <10 20 <10 >20¶ >40
67 20 Stallion Vienna <10 <10 <10 >100 >40

*A titer ≥10 was positive for West Nile virus (WNV) Is98 and Usutu virus (USUV) SAAR 1776 strains, and a titer ≥20 was positive for WNV Eg101 and tickborne encephalitis virus (TBEV) Hypr strains.
†Titrated up to a dilution of 1:40.
‡Titrated up to a dilution of 1:100.
§Cytotoxic at lower dilutions.
¶Insufficient sample material to analyze higher serum dilutions.

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