Current Status of the Invasive Mosquito Species,
Aedes aegypti in San Joaquin County
Shaoming Huang, Ph.D.
Entomologist
• Daytime vicious and sneaky biter: approaches from behind and bites on the ankles and elbows; follows people until getting a blood meal
• Highly prefers humans, lesser degree domestic mammals; biting pressure is high! Images: Alex Wild Photography
What is Aedes aegypti – Biting Behavior
Aedes aegypti is a nuisance
Urban Epidemic
transmission Cycle
Aedes aegypti
Humans
What is Aedes aegypti – Disease Transmission
Aedes aegypti is the primary mosquito species transmitting diseases including Dengue, Zika, Yellow Fever, and Chikungunya
Aedes aegypti
Humans
Local transmission is
possible in areas where both
the diseases and Aedes
aegypti are present.
What is Aedes aegypti – Disease Transmission
• Dengue outbreaks occur in many countries in tropical and sub-tropical climates • WHO Worldwide Estimates:
40 ~100 million cases per year (3 cases per second!)
25,000 deaths per year
Death rate 1-5%
Dengue Cases in the Americas, 1980-2024
What is Aedes aegypti – Disease Transmission
2023 2018:
laboratory
acquired cases
2023:
178
Travel related Dengue cases in the US, 2010 - 2023 Locally acquired Dengue cases in the US, 2010 - 2023 2013: 24
2020: 12
San Joaquin County: 18 cases
2022
Aedes aegypti – Global Invasion
Tabachnick, W. J. 1991. Am. Entomol. 37: 14–24.
Aedes aegypti – Spread in the US
Hahn, M. B., et. al. 2016. J. Med. Entomol. 53(5): 1169-75. 1995 - 1999 1999 - 2016
The Spread of Aedes aegypti in California
2013 - 2018
From Merced County to the
entire southern California region
2019
Stanislaus County
San Joaquin County
Sacramento County
Placer County
2020
Shasta County
Butte County
Sutter County
Santa Barbara County
Yolo County
Ventura County
2021
Solano County
2022
Contra Costa County
Santa Clara County
Santa Cruz County
2023
Glenn County
Yuba County
First detection of Aedes aegypti
in Madera County
Timeline of Aedes aegypti Discoveries in San Joaquin County 2021 Ripon
2021 Escalon 2022 Manteca
2022 South
Stockton
2023 Lodi
2019 Stockton
2023 Tracy
Locations with Aedes aegypti in San Joaquin County
Aedes aegypti @ Brookside Area, Stockton, 2019-2023
Early detection and intervention is the key to suppress the population to the lowest level possible! Aedes aegypti @ Ripon, 2021-2023
Aedes aegypti @ Escalon, 2021-2023
Aedes aegypti @ Manteca, 2022-2023
2024 Aedes aegypti Surveillance for Lathrop
2024 Locations for Aedes aegypti traps
• Trapping will start as early as the first week of May • Every location will be inspected once a week
• Results will be included in our weekly invasive
Aedes report
2024 Aedes aegypti Surveillance for Lathrop
BG-Sentinel traps for adult collection Oviposition traps for egg collection Community Engagement for Mosquito Control
How you can help to reduce Aedes aegypti AND other mosquito species:
• Allow us to inspect your property for mosquito breeding • Allow us to set traps in your front yard to monitor mosquito populations • Report day biting mosquitoes
• Dump out standing water; Remove or tip over anything that may hold water • Screen drains to prevent mosquitoes from laying eggs in the drains • Tell your neighbors, families and friends to do the same Aedes aegypti – Container Breeder
Aedes aegypti @ South Stockton
Community Engagement for Mosquito Control
What you can help to reduce Aedes aegypti AND other mosquito species:
• Allow us to inspect your property for mosquito breeding • Allow us to set traps in your front yard to monitor mosquito populations • Report day biting mosquitoes
• Dump out standing water; Remove or tip over anything that may hold water • Screen drains to prevent mosquitoes from laying eggs in the drains • Tell your neighbors, families and friends to do the same Questions?
https://www.sjmosquito.org/