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Dengue in the USA: California

03 November 2023

As of 3 November 2023, public health officials have reported 2 cases of locally-acquired dengue in California. The first case was reported in Pasadena on 20 October 2023 and the second was reported in Long Beach on 1 November 2023.

These are the first locally acquired cases of dengue to reported in California.

Advice for Travellers

Dengue is an infection found in tropical and sub-tropical climates worldwide. It has occurred in the USA in recent years. Dengue is spread by Aedes mosquito bites and can cause a severe flu-like illness.

All travellers to endemic regions are potentially at risk of dengue fever and should be aware of this infection.

Aedes mosquitoes are particularly persistent and aggressive. They bite between dawn and dusk.

A new dengue vaccine Qdenga® has been licensed in the UK and is awaiting JCVI recommendations for use.

Travellers developing a fever during or on return from travel are advised to seek medical attention as soon as possible.

For further information see TRAVAX dengue fever page.