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Residents can call 2-1-1 for help locating a health care provider. Health care providers can call the Acute Communicable Disease Control Program for more dengue information: (213) 240-7941.

For help with reducing mosquitoes in and around your home, find your Vector Control District by zip code here.

Health care providers are mandated to report dengue and other mosquito-borne infections.

Report any suspected locally acquired dengue to Public Health immediately by phone.

Los Angeles County DPH Acute Communicable Disease Control:

  • Weekdays 8:30am–5pm: call 888-397-3993.
  • After-hours: call 213-974-1234 and ask for the physician on call.

Long Beach Health and Human Services:

  • Weekdays 8am-5pm: call 562-570-4302.
  • After hours: call the duty officer at 562-500-5537.

Pasadena Public Health Department:

  • Weekdays 8am-5pm: call 626-744-6089.
  • After hours: call 626-744-6043.

Travel-associated dengue infections must be reported to Public Health within 1 working day from identification.

Los Angeles County DPH Acute Communicable Disease Control:

  • Mail or fax - complete a Confidential Morbidity Report (CMR) form and follow fax, secure email, and mail instructions, or
  • Phone – call 888-397-3993 weekdays 8:30am-5:00 pm.

Long Beach Health and Human Services:

Pasadena Public Health Department:

  • Complete a Pasadena CMR and send by fax to 626-744-6115, or
  • Call 626-744-6089 weekdays 8:00 am-5:00 pm.

Visit Provider Communicable Disease Reporting in LA County to learn more about mandated reporting.

dengue graph

*Data updated as of 5/20/2026.

**All data is based on symptom onset date and excludes the health jurisdictions of Long Beach and Pasadena.

Locally Acquired Dengue Infections in Los Angeles County, by Year**
Year 2024 2025 2026*
Count 15 7 0

*Data as of 5/20/2026. Counts include symptomatic cases and asymptomatic infections.

**Does not include Long Beach or Pasadena cases.

What is Dengue?

Dengue is a disease caused by a virus that spreads to people mainly through mosquito bites. Dengue is common in tropical and subtropical regions such as the Caribbean (including Puerto Rico), Central and South America, Southeast Asia, and the Pacific islands. See CDC Areas with Risk of Dengue. In the recent years, dengue was detected in LA County residents who had not recently travelled to these areas. Local mosquitoes can carry the virus, and it is important to take preventive measures to reduce the risk of mosquito-borne diseases.

Symptoms of Dengue

About one in four people with dengue will get symptoms.

Symptoms of dengue typically last 2–7 days. Most people will recover after about a week. About one in 20 people with dengue can develop severe disease which can be life threatening.
THE MOST COMMON SYMPTOMS ARE FEVER
Fever

Fever

AND ONE OR MORE OF THE FOLLOWING:
Eye Pain

Eye Pain

Headache

Headache

Muscle, Bone, or Joint Pain

Muscle, Bone, or Joint Pain

Nausea or Vomiting

Nausea or Vomiting

Rash

Rash

The best way to prevent getting dengue is to avoid mosquito bites

Prevention

There are no specific medicines to treat dengue. There are supportive medicines to help with fever and pain. There is a vaccine for dengue, but it is NOT approved for use in U.S. travelers who are visiting but not living in an area where dengue is common.

It is important to note that this infection is preventable! By taking action to decrease mosquito breeding by checking our own homes and yards weekly for items that hold standing water where mosquitoes can breed- and to clean, cover or clear out such items-, keeping pools well maintained, stocking ponds with mosquito fish which eat mosquito eggs. Since mosquitoes can breed in anyone’s backyard, it takes only a few infected mosquitoes to place the whole community at risk.

Residents can also protect themselves from mosquito bites by using mosquito repellant in the form of spray, wipes or lotion, wearing long-sleeved shirts and pants, and by making sure our windows and door screens are in good condition to prevent mosquito entry.

When used as directed, Environmental Protection Agency (EPA)-registered insect repellents are proven safe and effective, even for pregnant and breastfeeding women. Use an EPA-registered insect repellent with one of the following active ingredients:
✔ DEET
✔ Picaridin
✔ IR3535
✔ Oil of lemon eucalyptus (OLE)
✔ Para-menthane-diol (PMD)
✔ 2-undecanone

If residents are traveling to areas of the world that have dengue or other mosquito-borne diseases

✔ Use EPA registered mosquito repellent
✔ Wear long sleeved shirts and pants
✔ Stay in enclosed and air-conditioned rooms
✔ Upon return, continue to use repellent for 21 days

Individuals infected with dengue can stop the spread of the virus by protecting themself from any more mosquito bites for at least 7 days after the start of fever (this can be done by staying indoors and/or using mosquito repellents with DEET). During this time, dengue virus can be found in the blood and passed from an infected person to another mosquito through mosquito bites. An infected mosquito can then spread the virus by biting other people.


Dengue Vaccine

Dengvaxia was approved by the Food and Drug Administration in 2021 and is recommended for children and adolescents aged 9 – 16 years who have had a laboratory confirmed previous dengue virus infection AND live in areas where dengue is common. Three doses are required for protection against dengue infection.

However, production of this product was discontinued due to low demand and currently, this vaccine cannot be ordered from manufacturers. The last doses of this product will expire in August 2026. The vaccine is not recommended for children who have not had dengue due to an increased risk of hospitalization and illness if infected after vaccination.

There are currently no other vaccines under review by the FDA, although other dengue vaccines that are approved for use in other countries.

See Health Education for FAQs and other resources in English and Español.

For Help Controlling Mosquitos, Contact Your Local Vector Control District

LAC DPH is responsible for monitoring and addressing human health problems in Los Angeles County (excluding Pasadena and Long Beach, which have their own public health departments), but is not directly involved with mosquito control activities. This important action is under the control of the county’s five independent vector control districts. The Long Beach Health Department also operates its own mosquito control program.
To report a potential mosquito breeding situation or find more information about mosquitoes: please contact the appropriate Vector Control District or city public health department:
Antelope Valley
(661) 942-2917
Greater Los Angeles
(562) 944-9656
L.A. County West
(310) 915-7370
Compton Creek
(310) 933-5321
San Gabriel Valley
(626) 814-9466
City of Long Beach
(562) 570-4132
Orange County
(714) 971-2421
Additional information is available at SoCalMosquito.org

News and Updates

  • LAC DPH Health Advisory: Locally Acquired Case of Dengue in Los Angeles County PDF | Web/Mobile (10-15-25)
  • News Release: Public Health Investigating First Case of Locally Acquired Dengue for the 2025 Mosquito Season (10-15-25)
  • CDC Health Update: Ongoing Risk of Dengue Virus Infections and Updated Testing Recommendations in the United States CDC Health Update PDF | Web/Mobile (3-18-25)
  • LAC DPH Press Release: More Cases of Locally Acquired Dengue Virus Identified in Baldwin Park (10-15-24)
  • LAC DPH Press Release: Public Health Investigating Fifth Case of Locally Acquired Dengue (10-2-24)
  • LAC DPH Press Release: Public Health Investigating One Additional Case of Locally Acquired Dengue (9-25-24)
  • LAC DPH Press Release: Public Health Investigating Unprecedented Cluster of Locally Acquired Dengue Cases - Residents urged to take steps to prevent ongoing transmission (9-18-24)
  • LAC DPH Press Release: Public Health Confirms Case of Locally Acquired Dengue (9-9-24)
  • Long Beach Department of Health and Human Services: Long Beach Health Department Confirms Case of Locally Acquired Dengue (11-1-23)
  • CDC MMWR: First Locally Acquired Dengue Virus Infections — Pasadena, California, October–December 2023
  • CDC MMWR: First Evidence of Locally Acquired Dengue Virus Infection — Maricopa County, Arizona, November 2022

Resources for Providers

Recent Health Alerts

LAC DPH

CDC

  • Dengue for Healthcare Providers homepage
    Pocket Guide

CDPH

Health Education

Resources from the LA County Department of Public Health

Resources from the Centers for Disease Control and Prevention

Resources from the California Department of Public Health

Additional Information