For example, travelers entering Venezuela from certain countries are required to show a current yellow fever vaccination certificate.) (travelinsurancereview.net)
A certificate of yellow fever vaccination is required to enter Kenya or Uganda. (zicasso.com)
The CDC and the government of Brazil recommend yellow fever vaccination for those visiting a number of areas, including the capital Brasília, as well as the popular tourist destination of Iguassu Falls. (frequentbusinesstraveler.com)