Tiger mosquitoes are driving a rise in locally transmitted cases of diseases once considered tropical, including chikungunya, Zika, dengue and West Nile virus. The majority of cases remain imported from endemic regions such as Asia, the Caribbean and the Pacific Islands, but locally transmitted infections are increasing among people who have not traveled. The most recent bulletin reports 115 locally transmitted chikungunya cases, 11 dengue cases and seven West Nile virus cases this year. Locally transmitted cases have expanded beyond southern France and Corsica into central, northern and south-west regions. A map identifies communes with local chikungunya or dengue transmission.
Due to the spread of tiger mosquitoes, France is now reporting rising numbers of cases of what were previously considered to be 'tropical' diseases such as chikungunya, Zika, dengue fever and West Nile virus. It's still true that the majority of cases of chikungunya, Zika, dengue and West Nile fever in France occur in people who have recently been in an area where those illnesses are endemic, such as Asia, the Caribbean or the Pacific Islands.
But due to the growing presence of tiger mosquitoes in France - which can spread these illnesses - there are a rising number of cases reported among people who have not left France. These 'cas autochtones' (locally-transmitted cases) are also no longer confined to France's Mediterranean coast and have been reported in northern and central France. READ ALSO: How to protect yourself from mosquito-borne illnesses in France
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