[jotono]

First, write your will before you leave for Kenya coz chances of returning are slim.
Those Kenyans you see have long developed immunity to all sorts of diseases. They even fack without a condom coz they got hiv immunity too. Problem is not Kisii nor Kisumu. Problem is how do you reach there safely, unharmed and without having already acquired an illness? There is Malaria, TB., Cholera, hiv, and yellow fever should be least among your concerns. What the heck, even Ebola outbreak might occur hours after you arrive. What will you do then?
Then there are muggers who lurk around the main airport in Nairobi 24/7. Make sure you have enough dollars on you coz if your purse is not loaded, you become kaput.

Friendly advice: if you really want to visit Kenya and be relatively safe, find your way thru’ Dar es salaam to Malindi (on the coast) and play freely on the beach. Its safe there coz so many wazungus, and no muggers there. All they might ask from you is a friendly fack. From there, board a light plane directly from Malindi to Maasai Mara. Watch the animals there. There are many flights by small plane from Maasai Mara to other tourist sites. Safe areas, those. Other parts of the country, too many muggers waiting for your arrival. Karibu.