It sounds counterintuitive. You spent three years in Lagos, eighteen months in Accra, or a posting across several West African countries.

In 2025, a senior management consultant missed a last-minute project in Angola. She had received her yellow fever vaccine years earlier and was fully protected.

You have a valid yellow fever certificate. The vaccinations are booked. The itinerary is printed and pinned to the fridge. You have done the research, and you feel confident everything is covered.