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Aedes aegypti and Aedes​ albo​pictus M​osquitoes​

Invasive Aedes Mosquitoes in​ California

Two invasive (non-native) mosquito species have become established in some California counties (PDF), and there is a potential for them to spread into other regions of the state. They are named Aedes aegypti (the yellow fever mosquito) and Aedes albopictus (the Asian tiger mosquito). Unlike most native mosquito species naturally found in California, Aedes aegypti and Aedes albopictus bite during the day. Both species are small, black mosquitoes with white stripes on their back and legs. They can lay eggs in any small artificial or natural container that holds water.

Aedes aegypti mosquito

​Aedes aegypti

Aedes albopictus mosquito

Aedes albopictus

Aedes aegypti and Aedes albopictus can transmit several viruses to people when they bite, including dengue, chikungunya, Zika, and yellow fever. These viruses are widespread in other parts of the world, including in Mexico, Central and South America, the Caribbean, and Asia, but are not known to be currently found in mosquitoes in California. People traveling in areas where these viruses are present can become infected from mosquito bites. When they return to California, people that are infected can serve as sources for mosquitoes to become infected and pass the virus to others. In this way, limited local transmission of dengue virus has occurred in California. 


Travelers can protect themselves and others by preventing mosquito bites. When traveling to areas with dengue, chikungunya, or Zika, use insect​ repellent, wear long sleeves and pants, and stay in places with window and door screens. It's also important to use insect repellent for three weeks after returning home to prevent the spread of viruses to Aedes aegypti and Aedes albopictus mosquitoes in California. ​

Sample Messaging

Invasive Aedes mosquitoes are spreading throughout California. Los mosquitos Aedes invasores se están extendiendo por todo California.


  • Invasive Aedes mosquitoes, with distinct black and white bands, continue to spread throughout California. Experts are working hard to control these mosquitoes that can be an extreme nuisance and have the potential to spread disease. ​​See where Aedes have spread:​


  • ​​​​​Los mosquitos invasores Aedes, con distintas bandas blancas y negras, continúan propagándose por California. Los expertos están trabajando arduamente para controlar estos mosquitos que pueden ser una molestia extrema y tienen el potencial de propagar enfermedades. Vea dónde se ha propagado el Aedes

Take charge of your yard. Drain standing water, keep pools clean, and toss unneeded containers. 
Hágase cargo de su jardín drene el agua estancada; mantenga las piscinas limpias Tire los contenedores y la basura innecesarios. 


  • Take charge of your yard! Eliminate standing water in buckets, flowerpots, trash cans, and other containers around your home where Aedes mosquitoes can develop from egg to adult. Keep your yard free of trash and keep pools clean. Do your part to #FightTheBite! Learn more: ​​​


  • ¡Hágase cargo de su jardín! Elimine el agua estancada en baldes, macetas, botes de basura y otros contenedores alrededor de su casa donde los mosquitos Aedes pueden desarrollarse desde huevos hasta adultos. Mantenga su jardín sin basura y las piscinas limpias. ¡Haga su parte para luchar Contra las picaduras! Más información:​

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