An environmentally-safe and pesticide-free approach for the control of Asian tiger mosquito infestations in Southern California.

In the Sterile Male Tiger Mosquito Pilot Program, Vector Control will release sterile male Asian tiger mosquitoes (Aedes albopictus) in a localized area of South El Monte. Male mosquitoes do not bite and will mate with female tiger mosquitoes in the infestation zone. Eggs laid by these mated female mosquitoes will be sterile and will not hatch. The released males will die soon after mating. This program will show how well the control strategy can contribute to our overall Asian tiger mosquito control program.

This technique will only target the Asian tiger mosquitoes.

Asian tiger mosquitoes have taken broad hold in an increasing number of neighborhoods since they were detected in 2011. For four years, they have posed a potential public health risk to millions of people living in Los Angeles County. As they expand their presence, they increase the risk for local disease outbreaks of dengue and chikungunya.

While most cases are outside of the United States, residents traveling to areas with local transmission can come back infected. Infected travelers entering an area where Asian tiger mosquitoes are present can start a local outbreak of these debilitating illnesses.

There are at least
communities experiencing Asian tiger mosquito infestations in Los Angeles County

The Threat: A Local Virus Outbreak is One Bite Away

There have been travel-related cases of dengue and chikungunya in and near areas that are known to have Asian tiger mosquitoes in Los Angeles County. If conditions are right, this can expose communities to local outbreaks.

By reducing the population of Asian tiger mosquitoes, we reduce the threat of local transmission of exotic diseases like dengue  and chikungunya.

In 2015, CDC confirmed
of travel-related chikungunya cases in the U.S. were in California


Chikungunya (Chik-gun-GOON-ya) is a debilitating and painful, but rarely fatal mosquito-transmitted virus. Since 2013, there are 1.4 million reported cases from South America, the Caribbean and Mexico. In 2014, there were 50 confirmed cases of U.S. travelers coming back to Los Angeles County with the virus.

Yellow fever mosquitoes and Asian tiger mosquitoes can transmit chikungunya; both of these mosquitoes are present in Los Angeles County.

Symptoms include:

  • Painful joint / muscle pain that can last for several months
  • Fever

Most people (80%) bitten by an infected mosquito will get sick. There is no available vaccine for chikungunya. Read more about Chikungunya on CDC’s website. Learn more about how Chikungunya affected more than one million people around the world in the past few years — Science News. Note: The map in the article has not been updated to show that we, in California, have the mosquito that can transmit chikungunya.

Dengue fever

Dengue fever is only transmitted by mosquitoes from one infected person to another. Unlike West Nile virus, dengue viruses do not need birds or another host to transfer between people.

Yellow fever mosquitoes and Asian tiger mosquitoes can transmit dengue; both of these mosquitoes are present in Los Angeles County.

Symptoms include:

  • high fever
  • severe muscle / joint pain
  • mild bleeding

There is no vaccine for dengue. Read more about dengue fever on CDC’s website.

of the world's population, including people in LA County, are at risk of being exposed to dengue