Yellow Fever mosquito discovered in Placer County

For the first time, experts have found the invasive Aedes aegypti mosquito, commonly known as the Yellow Fever mosquito, in the North State.

Posted: Aug 30, 2019 5:18 PM
Updated: Aug 30, 2019 5:20 PM

ROSEVILLE, Calif. - For the first time, experts have found the invasive Aedes aegypti mosquito, commonly known as the Yellow Fever mosquito, in the North State.

The bug appeared this week in Sacramento's Citrus Heights and in Roseville in Placer County. Unlike most native mosquito species, the Yellow Fever mosquito bites during the day, and can spread dengue, chikungunya and yellow fever. These viruses, however, have not been found circulating in California.

“While there has been no transmission of these viruses, the appearance of these mosquitoes warrants extra precautions,” said Placer County Public Health Officer Rob Oldham.

“Our first step is to follow our invasive species response plan and do everything we can to conduct eradication efforts to protect our residents and public health,” said Joel Buettner, General Manager of the Placer Mosquito and Vector Control District. “At this point in time, we have detected one female Aedes aegypti mosquito and are trying to determine the full extent of the infestation.”

Placer District uses a science-based, Integrated Vector Management approach to assess mosquito activity and risk and conduct appropriate mosquito control. The District’s approach for the detected mosquito area is conducting door-to-door property inspections to determine the infestation level. The District is also coordinating with the Sacramento-Yolo Mosquito and Vector Control District on efforts since the mosquito was trapped near the county border.

The Aedes aegypti mosquito has been found in several Central Valley and southern California counties, including recent initial detections in San Joaquin and Stanislaus counties. The mosquito is small and dark with a white violin-shaped marking on its body.

The public can help protect themselves and public health by reporting unusual, daytime mosquito biting. The District recommends eliminating standing water on property and runoff or pooling from irrigation systems. Avoid mosquito bites by using EPA registered insect repellents. 

The Placer Mosquito and Vector Control District advise the public to implement the 3 Ds of protection:

• Drain or dump any standing water that may produce mosquitoes.
• Defend yourself and your home by using a CDC-recommended insect repellent and dressing protectively
when outside and make sure screens on doors and windows are in good condition.
• Contact the District for any additional help controlling mosquitoes around your home.

For more information, Placer Mosquito and Vector Control District can be reached at (916) 380-5444, or

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