Disease Explorer

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

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

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

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

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

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

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

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

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.

Tick-borne encephalitis, endemic across most of Switzerland. Vaccine for residents and visitors.

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

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