Vaccination is only recommended if you are planning on travelling to countries where yellow fever is present. However if you are traveling to an area where yellow fever is present, the vaccine is important because yellow fever is a life-threatening viral infection. For Europe and Asia no vaccination is necessary. In many cases, a single yellow fever vaccination is sufficient for lifelong protection. In certain cases a booster vaccination is advisable after 10 years or later. Some countries require a booster vaccination upon entry after 10 years despite the WHO's 1-dose recommendation. Since the yellow fever vaccine is a live attenuated vaccine, it should not be given during pregnancy or if you are immunocompromised.
Vaccination reactions are usually mild and may manifest as headache/limb pain and a slight fever. In very rare cases, serious reactions to the vaccination can occur. This risk can be additionally reduced by a careful clarification before each vaccination by a travel medicine center or by a physician with appropriate expertise. Therefore, vaccination in Switzerland may only be carried out at such sites.