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Volume 8, Number 12—December 2002

Research

West Nile virus Epidemic in Horses, Tuscany Region, Italy

Gian Luca Autorino*, Antonio Battisti*, Vincent Deubel†, Giancarlo Ferrari*, Riccardo Forletta*, Armando Giovannini‡, Rossella Lelli‡, Severine Murri†, and Maria Teresa Scicluna*
Author affiliations: *Istituto Zooprofilattico Sperimentale delle Regioni Lazio e Toscana, Rome, Italy; †Institut Pasteur, Lyon, France; ‡Istituto Zooprofilattico Sperimentale dell’Abruzzo e del Molise, Teramo, Italy;

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Table 1

Complement fixation test findings in stables with clinical cases (zone A)a

Seroprevalence (%)
Stable Horses present Clinical cases 1st samplingb 2nd samplingc
1 25 2 11/21 (52.4) not available
2 5 1 3/5 (60) 1/3 (33.3)
3 12 2 6/10 (60) 6/10 (60)
4 49 2 9/13 (69.2) 5/11 (45.4)
5 7 1 2/7 (28.6) 1/5 (20)
6 270 1 5/49 (10.2) 3/41 (7.3)
7 52 1 9/20 (45) 2/20 (10)
8 18 1 6/8 (75) 5/9 (55.5)
9 60 3 12/26 (46.1) 8/25 (32)
Total 498 14 63/159 (39.6) 31/124 (25)

aRepeat titers (October–November 1998) were obtained from 123 horses.
bPerformed October 12–16, 1998.
cPerformed November 9–13, 1998.

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