| west nile virus infection in free-ranging squirrels in illinois. | west nile virus (wnv) infection was diagnosed in 13 gray squirrels (sciurus carolinensis) and 3 fox squirrels (sciurus niger) that were observed with neurologic signs before death or found dead. all 16 had gliosis throughout all sections of the brain. most had lymphoplasmacytic encephalitis or meningoencephalitis, many with admixed neutrophils. neuronal necrosis and neuronophagia were also prominent features. west nile virus antigen was demonstrated in the brain, spleen, heart or kidney in 10 of ... | 2004 | 15152831 |