Short Bites Monthly

Your digest for July 2025.

Hand holding a smartphone with a mosquito image, titled "July Update."

This Short Bites Monthly e-blast shares insight into the past year’s activity. This ensures that our data as a public health agency remains transparent to the public and to people who are interested in our mission.

May contain: pickup truck, transportation, truck, vehicle, person, clothing, footwear, and shoe — **We continue to provide the highest level of protection from vectors and vector-borne diseases to reduce outbreaks of human diseases in San Gabriel Valley.**

District Communication

A person holds a cardboard tube and a circular object in a grassy outdoor setting. — *Image of sterile, non-biting male mosquitoes being released to mate with wild females, so their offspring will not hatch and the mosquito population decreases over time.*

The San Gabriel Valley Mosquito & Vector Control District is proud to launch a new sustainable initiative: SGV Mosquito Match! This innovative program uses Sterile Insect Technique to help control populations of invasive Aedes mosquitoes (commonly known as ankle biters).

Aedes mosquitoes are aggressive daytime biters and are capable of transmitting serious diseases such as Zika, Dengue, and Yellow Fever. To combat this threat, our method involves releasing sterile male Aedes mosquitoes that carry Wolbachia (a naturally occurring bacterium found in more than 60% of insect species), which cannot produce offspring when they mate with wild female mosquitoes.

When they MATCH their eggs don’t HATCH:

Infographic on sterile insect technique with Wolbachia bacteria in Aedes mosquitoes to reduce mosquito populations. — *Illustration of how Sterile Insect Technique works in the SGV Mosquito Match Program.*

Learn about our first release

Outreach Overview

Mosquito Activity

Map showing blue circles over the Los Angeles area, highlighting locations in Pasadena, El Monte, and Pomona. — *Image of this month's mosquito activity by latitude and longitude. Bubble size indicates mosquito abundance per trap.*

Pie chart showing species distribution: Cx quinquefasciatus (79.75%), Ae aegypti (7.66%), Cs incidens (6.05%), Cx erythrothorax (3.7%), etc. — *Image of this month’s mosquito trap collection by species throughout San Gabriel Valley.*

May contain: animal, insect, invertebrate, and mosquito — **We continue to maintain essential vector surveillance including mosquito traps for disease testing, providing weekly data to** **the District, and maintaining** **mosquito fish**.

Mosquito Seasonal Activity Returns to San Gabriel Valley

A mosquito on human skin. — *Image of Native Culex Mosquito, the species is responsible for transmitting West Nile Virus (WNV).*

The District has confirmed its first West Nile virus (WNV) activity of the season within its service area. WNV is a yearly threat, consistently detected in both infected animals and, occasionally, in humans each year.

With this being the first detection of the season, the District continues its proactive efforts to monitor and control the spread of the disease. Residents are urged to stay alert and help reduce mosquito breeding by practicing the Tip, Toss, and Protect method.

Learn more