Mosquitoes carrying West Nile virus have been found in Fullerton, as well as in other areas including Clark County and Haverstraw. The virus appears to be spreading, with Los Angeles County confirming its first cases of the summer and the virus making its first appearance in South Dakota this season. The spread of West Nile virus seems to be happening at a faster rate than it has in 20 years, although the overall extent of the spread is not clear.