Experts say parts of the valley have been seeing a spike in mosquitoes, especially after the recent floods.
They say the one area in the northwest near Floyd Lamb Park has been a big problem area.
The recent flooding that hit the area, making the problem worse. That's because mosquitoes can quickly breed in standing water.
"These eggs can essentially rehydrate and have a really large hatch of which are very aggressive very persistent biters and come off in really large quantities," explains Vivek Raman with the Southern Nevada Health District.
Raman says he's tested several flood water mosquitoes recently, and that some tested positive for West Nile Virus.
In the long run, they're hopeful more drainage projects being done in the northwest will alleviate some of the problems with flooding, but in the meantime, you should be aware of mosquitoes in any standing water, even small water sources around your house.