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Volume 32, Number 5—May 2026

Research

Investigation of and Response to Autochthonous Dengue, Los Angeles County, California, USA, August–November 2024

Aisling M. VaughanComments to Author , Claire Park, Van P. Ngo, Zuelma A. Contreras, Jordan John Lee, Phoebe Danza, Meredith Haddix, Olivia Moir, Nicole Green, Michael Brown, Taylor Burleson, Amy Marutani, Ashley Nicholas, Tristan Hallum, Steve Vetrone, Liza Ortiz, Gladys Fernandez, Eric El-Tobgy, Jose Escobar, Tricia-Nicole Gandela, Cristin Mondy, Jan King, Brandon Dean, Elizabeth Rubin, Pablo Valadez, Stella Fogleman, Dawn Terashita, Sharon Balter, and Umme-Aiman Halai
Author affiliation: Epidemic Intelligence Service, Centers for Disease Control and Prevention, Atlanta, Georgia, USA (A.M. Vaughan); Los Angeles County Department of Public Health, Los Angeles, California, USA (A.M. Vaughan, C. Park, V.P. Ngo, Z.A. Contreras, J.J. Lee, P. Danza, M. Haddix, O. Moir, L. Ortiz, G. Fernandez, E. El-Tobgy, J. Escobar, T.-N. Gandela, C. Mondy, J. King, B. Dean, E. Rubin, P. Valadez, S. Fogleman, D. Terashita, S. Balter, U.-A. Halai); Public Health Laboratory, Los Angeles (N. Green, M. Brown, T. Burleson, A. Marutani, A. Nicholas); San Gabriel Valley Mosquito and Vector Control District, Los Angeles (T. Hallum); Greater Los Angeles County Vector Control District, Los Angeles (S. Vetrone)

Main Article

Figure

Timeline and geographic distribution of autochthonous dengue cases and public health response, Los Angeles County, California, USA, 2024. A) Timeline of cases (circles) by date of report, or date of confirmation (positive laboratory result) for a household member. Colors indicate residential neighborhood (see key in panel B); shaded bars indicate vector control and public health response activities in each neighborhood after identification of a locally acquired case. B) Map of Los Angeles County. Circles indicate cases identified by neighborhood; numbers indicate total cases per neighborhood. Case identified in neighborhood E was initially classified as a travel-related case; however, retrospective review revealed travel only to areas without ongoing DENV transmission. Based on that information, the case was reclassified as locally acquired. Inset shows location of Los Angeles County within California. DENV, dengue virus; WNV, West Nile virus.

Figure. Timeline and geographic distribution of autochthonous dengue cases and public health response, Los Angeles County, California, USA, 2024. A) Timeline of cases (circles) by date of report, or date of confirmation (positive laboratory result) for a household member. Colors indicate residential neighborhood (see key in panel B); shaded bars indicate vector control and public health response activities in each neighborhood after identification of a locally acquired case. B) Map of Los Angeles County. Circles indicate cases identified by neighborhood; numbers indicate total cases per neighborhood. Case identified in neighborhood E was initially classified as a travel-related case; however, retrospective review revealed travel only to areas without ongoing DENV transmission. Based on that information, the case was reclassified as locally acquired. Inset shows location of Los Angeles County within California. DENV, dengue virus; WNV, West Nile virus.

Main Article

Page created: March 24, 2026
Page updated: April 06, 2026
Page reviewed: April 06, 2026
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