Please also remember that if they checked the proof that you have taken the relevant shots, eg. yellow fever, they will also take into consideration any transit countries that you were in.
For example, in my case, on the way to Kili as well as the return trip, I transit via Addis Ababa. On my way back, I had to further transit in Bangkok. At the Bangkok airport, they checked my proof of yellow fever and other shots' since to them I had just came from Addis Ababa.
In my case, I had all the shots taken and its a gd thing the proof is in my carry-on luggage n not the check-in luggage.
Have fun on Kili.....