Post Megan Sebay

West Nile Virus Update – July 2019

San Mateo County

As of August 1, 2019, there have been 155 dead birds reported in San Mateo County. Of those, 31 have been suitable for testing and all 31 have tested negative for West Nile virus (WNV). No mosquito pools or sentinel chickens have tested positive for West Nile virus in San Mateo County in 2019.


August 2019 District Newsletter

New from the District in August: Oh, Rats!

Click here to read the August 2019 District Newsletter.

Blog post Megan Sebay

Rats Can Ruin Your Vacation, Too

Traveling to Hawaii this summer for a much needed vacation? Be aware of rat lungworm! This brain parasite is on the rise with six official cases confirmed so far this year.


Tick Surveillance Update for Water Year 2018-2019
June 2019

Laboratory staff continued collecting Ixodes pacificus ticks in the nymph life stage and adult Dermacentor ticks during the month of June. Collections in June occurred at Año Nuevo and the nearby Costanoa campground. A very high number of Dermacentor ticks have been collected from this location because District staff have made multiple collecting trips as part of a study on Tularemia.

Blog post

A New Cockroach on the Block

The District lab recently identified Turkestan cockroaches in samples submitted by a county resident. The Turkestan cockroach, Blatta lateralis, was first noticed in California in 1978 around Sharpe Army Depot. Researchers believe they were initially introduced to California from military equipment returning from Asia or Afghanistan. In many parts of the United States, the Turkestan cockroach is rapidly displacing the oriental cockroach, Blatta orientalis. Turkestan cockroaches produce considerably more offspring than do the oriental cockroach.

Event Megan Sebay

Outreach at Bayfront Cleanup Day

Join us at the City of San Mateo’s 35th Annual BayFront CleanUp Day at Ryder Park in San Mateo from 7:30 am until noon. Volunteers who show up to collect litter will be rewarded with a barbecue after, and we’ll be around to chat about how cleaning up litter doesn’t just help the environment – it helps prevent mosquitoes, too!

Event Megan Sebay

Outreach at San Mateo Senior Center Health & Wellness Fair

Join us at the San Mateo Senior Center Health & Wellness Fair at 2645 Alameda de las Pulgas. We’ll be there from 10am until 1pm to talk about how seniors can protect themselves from West Nile virus, as well as what services are available to help out with rodents, nuisance wildlife, and other pest and vector concerns that affect seniors.


Invasive Aedes Mosquitoes


Request Service


Report a Dead Bird


Board Meeting Agendas