Investigate mosquito-borne disease referrals within one business day

This goal is to reduce the risk of a local transmission of mosquito-borne illness

How are we doing?

Through timely investigations of reported mosquito-borne illness, the Vector Control Program reduces the spread of disease by implementing appropriate interventions.
From January through March 2020 100% of referrals received were investigated within one business day.

How is this measured?

Upon notification of a suspected or confirmed human case of mosquito-borne illness from the County Health and Human Service Agency, a Vector Control Program field investigation is activated through an electronic referral system.  
The response time is calculated as the time between the referral received date and the field investigation date. Results are reported as "within one business day" or as "greater than one business day".

Why is this important?

Currently San Diego County has not had any locally-acquired cases of tropical mosquito-borne diseases such as Zika, dengue or chikungunya.  To further reduce the potential for a local transmission, the Vector Control Program investigates suspect or confirmed cases of mosquito-borne illnesses within one business day to evaluate if the species of mosquito capable of transmitting the illness is present. If the species is detected, an integrated pest management response is initiated which includes public education, trapping, testing, biological and/or chemical treatment to reduce the risk of local disease transmission within a community.

Where are we going?

With global travel, changes in climate, and the detection of the two invasive Aedes mosquito species (Aedes aegypti and Aedes albopictus) capable of transmitting viruses that cause illnesses such as Zika, dengue, and chikungunya, the Vector Control Program will continue to protect public health through routine trapping and testing of mosquitoes, conducting mosquito control, providing education and outreach, and timely investigation of human mosquito-borne diseases.  
We strive to partner with public to Prevent, Protect and Report!  Prevent mosquito breeding!  Look for and dump out standing water.  Protect yourself!  Apply Environmental Protection Agency (EPA)-registered insect repellents containing DEET, oil of lemon eucalyptus, picaridin, or IR3535 (especially while traveling to known areas with mosquito-borne diseases), and Report mosquito activity including mosquito bites received during the day to or visit for more information.
The Department of Environmental Health (DEH) enhances San Diegans' quality of life by protecting public health and safeguarding environmental quality, educating the public to increase environmental awareness, and implementing and enforcing local, state, and federal environmental laws.  For more information visit our website at