These are the first reports of locally transmitted Dengue virus in California. All previously known cases involved persons getting Dengue from infected mosquitoes while traveling outside the U.S:
Dengue virus case in Pasadena, October 20, 2023.
Dengue virus case in Long Beach, November 1, 2023.
A statement on this case from the Mosquito and Vector Control Association of California:MVCAC Dengue Statement.pdf