West Nile Virus Activity in the County

We conduct adult-mosquito-control treatments (AMTs) only when we detect a positive West Nile virus (WNV) infected mosquito, permitting weather conditions. We use these treatments to reduce the risk of human infection. Treatments must be performed as quickly as possible to protect public health and safety, and prevent illness and even death.

Whenever we conduct an AMT, you can access links to our press releases, pesticides used, and treatment maps listed in the chart below. If you are interested in subscribing to our adult-mosquito-control treatment notifications, view our frequently asked questions, or have questions about WNV and mosquito control, please see the additional information section at the bottom of this page.

WNV "season" usually begins around spring and lasts until early fall. For a list of treatments conducted in 2023, please visit our Previous West Nile Virus Treatments page.

2024 Adult-Mosquito-Control Treatments

Progress	Treatment Date and Location	Treatment  Zip Codes	Treatment Map Link	Press Release Link	Translations	Pesticide Used	Pesticide Label	Pesticide Safety  Data Sheet
	Date: 9/19/24 Location: San José and Unincorporated Santa Clara County	95118, 95124, and 95125	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 9/17/24 Location: San José and Campbell	95008, 95070, 95117, 95129, and 95130	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 9/12/24 Location: Sunnyvale and Santa Clara	94085, 94086, 94087, and 95051	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 9/10/24 Location: San José	95120	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 9/4/24 Location: San José	95110, 95124, 95125, 95126 and 95128	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 8/29/24 Location: San José	95112, 95131, and 95133	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 8/28/24 Location: San José and Unincorporated Santa Clara County	95116, 95127, 95132 and 95133	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 8/26/24 Location: Palo Alto	94301, 94303, and 94306	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Merus 3.0	Label	Safety Data Sheet
	Date: 8/22/24 Location: San José and Unincorporated Santa Clara County	95111, 95112, 95125, and 95136	Interactive Map	Press Release	Español tiếng Việt 中文 Tagalog	Zenivex	Label	Safety Data Sheet
	Date: 8/20/24 Location: San José	95123	Interactive Map	Press Release		Zenivex	Label	Safety Data Sheet
	Date: 8/15/24 Location: San José	95116 and 95133	Interactive Map	Press Release		Zenivex	Label	Safety Data Sheet
	Date: 8/13/24 Location: San José and Milpitas	95035, 95131 and 95132	Interactive Map	Press Release		Zenivex	Label	Safety Data Sheet
	Date: 8/6/24 Location: San José	95123 and 95136	Interactive Map	Press Release		Zenivex	Label	Safety Data Sheet
	Date: 8/1/24 Location: San José and unincorporated Santa Clara County	95116, 95127, 95131, 95132, and 95133	Interactive Map	Press Release		Zenivex	Label	Safety Data Sheet
	Date: 7/29/24 Location: San José and unincorporated Santa Clara County	95111, 95112, 95121, and 95122	Interactive Map	Press Release		Zenivex	Label	Safety Data Sheet
	Date: 7/24/24 Location: San José and unincorporated Santa Clara County	95127 and 95140	Interactive Map	Press Release		Zenivex	Label	Safety Data Sheet