Parts of Sacramento County will be sprayed for West Nile Virus later this week.

Intense West Nile activity is prompting aerial treatments for parts of Citrus Heights, Fair Oaks and Orangevale later this week.

"This is an area we have been monitoring over the past few weeks, an area where we have seen a lot of West Nile activity and where many birds and mosquitoes have both tested positive," Luz Maria Rodriguez with the Vector Control District said. 

Rodriguez will spray about 19,000 acres across Northern Sacramento County this Wednesday and Thursday between 8 p.m. and midnight.     

"We have also detected West Nile virus activity in other areas, specifically South Sacramento, Elk Grove, Davis is another area that we're closely watching," Rodriguez said.

About 126 mosquito samples and 97 dead birds in Sacramento County have already tested positive for West Nile.  

In Yolo County, 30 mosquito samples and 16 dead birds have tested positive.