Originally Posted by AlanInDC

Yellow Fever: Coming from the U.S., I didn't think Thailand would care about yellow fever and an airport connection in Ethiopia of only a few hours at which I did not even enter Ethiopia/leave the airport. That would be wrong. When I got to the immigration officer, who wants your passport, boarding card, and visa (if applicable), as soon as he saw Ethiopia, he handed it back to me and said I needed approval from the health department at the airport. I had to go there and fill out a form and get approved. As it happens, I have yellow fever vaccination so it wasn't a big deal. For those without, I don't know what would have happened.