[A tourist in the Engadin with fever, rash and arthralgia].

We present the case of an HIV-positive patient with fever, arthralgia and maculopapular exanthema following a stay in Thailand, in whom acute chikungunya infection was serologically confirmed. Treatment was purely symptomatic, as no specific antiviral therapy is available. In view of the increasing number of cases in tropical endemic areas, but also in regions close to the borders of our neighbouring countries, and the steady spread of the tiger mosquito in Switzerland, tropical viral infections such as chikungunya, dengue and Zika are becoming increasingly important for clinical practice in Switzerland.