Current West Nile Virus Information for San Mateo County

2024

A total of four dead birds have tested positive for West Nile virus in 2024.

Most recently, in May, a dead American crow collected from Menlo Park tested positive for West Nile virus; the result indicated that the bird may have been recently infected.

Three additional birds collected earlier in the year from Foster City (2 birds) and Menlo Park (1 bird) had also tested positive for West Nile virus. Those results indicated that the birds were likely not recently infected.

In late April, we started our sentinel chickens for the upcoming season. Learn more HERE.

For information about West Nile virus activity throughout California, click HERE.

2023

In 2023, no mosquito pools tested positive for West Nile virus in San Mateo County. No sentinel chickens tested positive for West Nile virus. For information about West Nile virus in humans and horses, visit: https://westnile.ca.gov/ or www.cdfa.ca.gov/AHFSS/Animal_Health/Wnv_Info.html

In 2023, a total of 15 dead birds tested positive for West Nile virus in San Mateo County. Positive birds were found in Belmont (1), Burlingame (1), Foster City (1), Redwood City (1 in Redwood City; 3 in Redwood Shores area; 2 on the border of Redwood City and North Fair Oaks), San Carlos (1), and Menlo Park (5). Additional mosquito trapping and testing done in areas where dead birds were found did not found any positive mosquitoes.

For tips on how to avoid mosquito bites and select a safe, effective mosquito repellent, click HERE.

Page last reviewed: May 15, 2024

Website Accessibility Policy

San Mateo County Mosquito and Vector Control District is fully committed to providing accessible facilities, elements and channels of communication to all members of the public. As part of this commitment, San Mateo County Mosquito and Vector Control District has a policy of providing an accessible website compatible with the Web Content Accessibility Guidelines (WCAG 2.1) and commercial screen reading software. All features of the website are coded to allow individuals with vision and other impairments to understand and use the website to the same degree as someone without disabilities. We welcome feedback and can often resolve issues in a timely manner if they arise.

If you need any special assistance or accommodations:

Call us at 6503448592

Ongoing Compliance Information

Compliance Officer

San Mateo County Mosquito and Vector Control District has designated a compliance officer for website disability-related accommodations. The compliance officer has received training in website accessibility and updates the site in accordance with those best practices. Contact our accessibility officer to report an issue.

Compliance Procedures and Reports

In addition to testing with users with a wide range of disabilities and coding our website to WCAG standards, San Mateo County Mosquito and Vector Control District regularly scans its website to ensure ongoing compliance, and makes timely changes to any inaccessible changes, if any are found.

Linked Documents and Third Parties

Please note that this site may link out to third-party websites, such as state or federal agencies, that do not have accessible content. This site may also include documents provided by third parties included in our agenda packets, for example. While we cannot control the accessibility of content provided by third parties, we are happy to assist any member of the public with reading and accessing content on our site.

See an opportunity for us to improve? Please contact our accessibility officer or call us at 6503448592.

Report a Website Accessibility Issue

We are committed to your ability to access all content, and we will respond to all requests as soon as possible.