California health officials say the West Nile virus is at its highest level ever in mosquitoes.  

Doctor Vicki Kramer with the California Department of Public Health emphasizes the seriousness of the situation.

"By testing mosquitoes, we've determined that the proportion of mosquitoes infected with this virus, is higher than it has ever been in California at this particular point in time," Kramer said. 

The department says in this past week there were 52 new cases reported.  

So far this year there have been 181 total cases reported to the CDPH, including eight confirmed deaths.