Incidence and effects of West Nile virus infection in vaccinated and unvaccinated horses in CaliforniaIan A. Gardner, Susan J. Wong, Gregory L. Ferraro, Udeni B. Balasuriya, Pamela J. Hullinger, W. David Wilson, Pei-Yong Shi and N. James MacLachlanVet. Res., 38 1 (2007) 109-116DOI: https://doi.org/10.1051/vetres:2006045