There are many vaccinations that autoimmune folks can take without consequence? But others that can be ...well.. problematic. Depends on the vaccines.
Such as Flu Vaccines? AI folks most likely can take and tolerate DEAD vaccines vs live ones. For other things you mite be 'shot for'? I'd first talk with your neurologist or immunologist or rheumatologist. GP's are far down the food chain in keeping up with these 'exotic' issues.
IF IT were me? I'd ask as many questions as I can, and FIND OUT as much as I could and then decide to 'get shot' sooner rather than later? Get it overwith ASAP to avoid getting side effects out of the country....Not a desirable thing to have happen.
I hope this helps? It's a hard set of decisions that must be made! 's - j

Going to Kenya sounds like a life dream! I'm sort of jealous? Bring back heaps of photos, please?