Santa Clara County public health officials have identified the first invasive Aedes aegypti mosquitoes of 2025 in the Santa Teresa neighborhood of South San Jose. Known for their aggressive daytime biting behavior, these mosquitoes can transmit diseases such as dengue, Zika, chikungunya, and yellow fever. ​

The discovery indicates that the species has survived the winter, raising concerns about its potential establishment in the area. Last year, 388 of these mosquitoes were trapped across San Jose, Santa Clara, and Gilroy. ​

Residents are urged to take the following actions:

• Eliminate Standing Water: Regularly empty and scrub containers that can collect water, such as bird baths, pet dishes, and plant saucers.​
• Allow Property Inspections: Permit vector control staff to inspect your property for mosquito breeding sites.​

By taking these steps, the community can help prevent the spread of these mosquitoes and the diseases they carry.