An invasive mosquito species known for carrying dangerous diseases has been spotted in several California counties, including San Diego County.

Identifying the Yellow Fever Mosquito

The invasive Aedes aegypti mosquitoes, commonly referred to as the yellow fever mosquito, have been identified in various counties. These mosquitoes, distinguishable by their black bodies and distinctive white stripes on their legs and back, are particularly concerning due to their ability to transmit Zika, dengue, yellow fever, and chikungunya viruses.

Statewide Surveillance Efforts

The California Department of Health has been actively monitoring the presence of invasive Aedes mosquitoes across the state for several years. This surveillance is part of a broader effort to track vector-borne diseases and mitigate potential public health risks.

Spread Across San Diego County

The San Diego Vector Control Program’s mapping indicates the presence of invasive Aedes mosquitoes throughout San Diego County, highlighting the need for vigilant monitoring and control measures.

Presence Across California

In addition to San Diego County, several other counties in California have reported the presence of invasive Aedes mosquitoes. While some counties have identified both Aedes aegypti and Aedes albopictus (tiger mosquito), others have only detected one species.

Dengue Virus Transmission

The California Department of Health has reported limited instances of local transmission of the dengue virus within the state. These cases typically involve mosquitoes biting individuals who have previously traveled to regions where these viruses are endemic.

Dengue Infections in California (as of April 1, 2024):

• Kings County: 1 case
• Napa: 1 case
• Riverside: 1 case
• San Francisco: 3 cases
• San Mateo: 1 case
• Santa Cruz: 2 cases
• Sonoma: 1 case
• Ventura: 2 cases
• Yolo: 1 case

National Distribution

The Centers for Disease Control and Prevention (CDC) has mapped the distribution of Aedes aegypti mosquitoes across the southern half of the United States, with varying concentrations in different regions. While the southwestern states of Arizona and New Mexico show less prevalence, the mosquito species remains a concern nationwide.

Breeding and Prevention

Invasive Aedes mosquitoes reproduce by laying eggs in small containers of water. Their rapid development from egg to adult, particularly in warm conditions, poses a significant challenge for control efforts.

Protecting Against Aedes Mosquitoes

To mitigate the risk of mosquito-borne diseases, individuals are advised to take preventive measures such as:

• Eliminating Standing Water: Regularly dump or treat any standing water around properties to prevent mosquito breeding.
• Securing Entry Points: Ensure that screens on doors and windows are intact to prevent mosquitoes from entering indoor spaces.
• Protective Clothing: Wear long sleeves and pants, especially during peak mosquito activity times.
• Insect Repellent: Use insect repellent containing DEET, picaridin, or other recommended ingredients to deter mosquito bites.

Seeking Assistance

For assistance with mosquito control or further inquiries, individuals can contact the San Diego Vector Control Program at 858-694-2888 or email [email protected].

Conclusion

The detection of invasive Aedes mosquitoes underscores the importance of proactive surveillance and community-based efforts to mitigate the spread of mosquito-borne diseases. By implementing preventive measures and collaborating with local vector control programs, communities can reduce the risk of transmission and safeguard public health. Stay informed and take necessary precautions to protect against these potentially dangerous vectors.

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