In this month's District Report: mosquito prevention for spring, West Nile Virus and Mosquito and Vector Control Awareness Week, and more.
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District News

  • No West Nile virus was detected in San Mateo County in March. The latest West Nile virus disease surveillance information can be found on the District website.
  • West Nile Virus and Mosquito and Vector Control Awareness Week will be observed April 17th - 23rd, 2016.
  • No invasive Aedes mosquitoes were found in San Mateo County in March.The latest invasive Aedes surveillance information can be found on the District website.
  • Laboratory Director Dr. Nayer Zahiri gave a presentation on head lice to local childcare providers at a meeting organized by San Mateo County Health on March 22nd.
  • District staff attended the 27th Vertebrate Pest Control Conference Mar. 7th - 10th.
  • Technician Jim O'Brien provided outreach at the Portola Valley Predators Day on March 13th.
  • Laboratory staff, along with staff from the California Department of Public Health, conducted rodent trapping for hantavirus and plague surveillance March 28th and 29th. Results are not yet available.
  • The District is currently hiring seasonal staff for the 2016 summer season.
  • The California West Nile Virus Hotline opens on April 18th. Callers can report dead birds for West Nile virus testing by calling 877-WNV-BIRD or visiting
Zika Virus in San Mateo County: An Update

On April 1st, San Mateo County Health System announced that a confirmed case of Zika virus had been identified in a county resident. This individual acquired the virus while traveling outside the United States, and has since fully recovered. No further information about the patient was released.

To date, there has been no transmission of Zika virus by mosquitoes in San Mateo County or anywhere else within the United States. The risk of Zika virus in San Mateo County, and elsewhere in the US, remains extremely low.

For the lastest information about Zika virus in San Mateo County, visit

For information on Zika virus from San Mateo County Health System, visit

For information on the risk of Zika virus to travelers, visit

West Nile Virus and Mosquito and Vector
Control Awareness Week, April 17th - 23rd

In August of 1999, two men checked into Flushing Hospital Medical Center with an unknown infection. Both men were over age 60, had similar symptoms, and were from the same neighborhood in New York City.

Days later, two more patients were identified with the same mysterious illness, then another four. They were very ill, with high fevers and paralysis of the arms and legs. Public health experts initially thought the patients had St. Louis encephalitis, but soon discovered that they were suffering from another mosquito-borne disease that had never before been seen in the United States: West Nile virus.

Today West Nile virus can be found in almost every state in the US, and in every county in California. Last year was the most deadly on record, with nearly 800 human illnesses and 53 deaths from West Nile virus in California. West Nile Virus and Mosquito and Vector Control Week recognizes the work done by mosquito and vector control and other public health agencies to reduce the risk of West Nile virus in California, and raises public awareness of the threat of West Nile virus and other mosquito-borne illnesses.

For more information about West Nile virus in California, visit

To learn how San Mateo County Mosquito and Vector Control District is working to reduce the risk of West Nile virus, visit


Spring into Action to Prevent Mosquitoes

Spring is here, and so are the mosquitoes. Here are a few simple steps you can take this spring to prevent mosquito problems on your property and reduce your risk of mosquito-borne illnesses like West Nile virus.

If you'll be saving rainwater to use later, remember that your rain barrel or other containers need to be screened, tightly covered, or completely emptied at least once per week. If you don't have a rain barrel yet, consider choosing one that comes already mosquito-proofed. The Bay Area Water Supply & Conservation Agency (BAWSCA) will even give you a $100 rebate toward the purchase of an approved rain barrel.

As we move into the dry season, avoid over-watering your lawn or garden. Check your yard for anywhere water may collect after watering or when sprinklers are on, including plant saucers, buckets or other containers, and folds in tarps or barbecue covers. Plan to move these containers away from areas that are watered, or empty them out at least once a week.

If your yard has a fountain, ornamental pond, water garden, or other water feature, make sure water is fully circulating. If you think mosquito larvae may develop, consider requesting a few mosquito fish. They're compatible with most other pond fish, and don't require any special care - you don't even need to feed them!

Need help checking your yard for mosquito problems? Give us a call at (650) 344-8592 or visit to request a free inspection.

Mosquito Surveillance and Control Data Updates

Visit our Mosquito Surveillance Data and Operations Statistics pages to get the latest data from our mosquito surveillance and control program. Due to the implementation of the District's new data management system, not all data is available for February and March.

Our Work by the Numbers

In March, District staff:
  • Inspected 400 acres of marsh at Bair Island
  • Responded to 169 service requests
  • Treated 58 acres of seasonal impounds for mosquito larvae
  • Conducted 20 rodent inspections
  • Treated 9.2 acres of marsh at Bair Island

District Financial Information for February, 2016

Visit our Financial Information page for the latest District financial information, including the Consolidated Funds and Profit and Loss as of February 29th, 2016.

Snapshots from the Field

Technician Kim Keyser holds a deer mouse during rodent-borne disease surveillance.
Technician Ryan Thorndike responds to a service request for an unusual number of caterpillars.
A head louse nymph is identified in a sample collected by laboratory staff.
Laboratory Assistant Mojdeh places a feeding station that will be used for a rodent study.
San Mateo County Mosquito and Vector Control District
Protecting public health since 1916

1351 Rollins Rd. | Burlingame CA 94041
(650) 344—8592 |

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San Mateo County Mosquito and Vector Control District · 1351 Rollins Rd. · Burlingame, CA 94010 · USA

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