Disease Explorer

Year-round risk in much of the tropics. Prevention combines mosquito avoidance with chemoprophylaxis.

Spread by daytime-biting Aedes mosquitoes. Severe dengue is rare but the risk rises with a second infection.

Sudden fever with joint pain that can last months. Same Aedes mosquitoes as dengue.

Single dose protects for life. Required for entry into many African and South American countries.

Persistent fever from contaminated food and water. Two vaccines available — useful for longer or rougher trips.

Common worldwide, easy to catch, easy to prevent. Two-dose vaccine gives long-term protection.

Nearly always fatal once symptoms start. Pre-exposure vaccine simplifies what to do after a bite.

Severe diarrhea that can dehydrate within hours. Vaccine for outbreak areas and humanitarian work.

Rural Asia, especially during monsoon. Vaccine for stays of a month or more in farming areas.

Tick-borne encephalitis, endemic across most of Switzerland. BAG-recommended vaccine for residents and visitors.

Usually mild — but congenital Zika syndrome makes pregnancy planning the central concern.

Mostly spread by close skin-to-skin and sexual contact. Vaccine available for high-risk groups.

Amazon-basin fever from tiny biting midges that slip through normal nets. Looks like dengue and often relapses.