Yellow Fever - Nairobi-Uganda-Nairobi

Hello, no luck answering this from a search so thought i'd start a new thread:

I'm flying into Nairobi and getting the bus to Uganda. Three weeks in Uganda, two of which will be working in a children's home. Then back to Nairobi for flight.

I'm a bit confused about Yellow Fever requirements. I know both Kenya and Uganda are yellow fever zones but am confused about whether I need a certificate to enter the countries, or only to enter the countries from another yellow fever country.

If the latter, does the fact that i'm only in Kenya for a matter of hours matter or will I still need a certificate to get into Uganda? Likewise, when i re-enter Kenya will they want a certificate even through i'm only passing through?

Sorry this is a bit garbled! If anyone can clarify what I legally require I'd be very grateful!

Katherine :-)

Legally you are required to have the certificate, as you will be entering both countries from an YF area. Whether they check at the border or not may be a different story.
But anyway - the main reason for getting the vaccination is not to please the border officials, but to avoid getting ill, so unless there is a good reason why you can't be vaccinated (e.g. allergies)m you should get it for your own safety.

last couple of times I did the trip there was no need to produce my vaccination certificate. At one time you had to go to customs, health, and then immigration at the land border, not anymore it's much easier these days.

yes, you need one

as a matter of fact, one of the few times i got asked was overland from Kenya into Uganda, and I had lost it, so I had to bribe dearly

Thanks guys :-) Will get jabbed!