Malaria prophylaxis is the non-negotiable
CDC lists atovaquone-proguanil and doxycycline among first-line prophylaxis options for both countries. Atovaquone-proguanil is the common short-trip choice: one tablet daily with food, from 1–2 days before entering the risk area until 7 days after leaving. Doxycycline runs cheaper for longer trips but continues 4 weeks after return and brings real sun-sensitivity — a genuine consideration on equatorial game drives. One nuance: highly urbanized central Nairobi carries only rare cases — bite precautions there, pills for the parks.
Climbing Kilimanjaro changes the plan
Uhuru Peak is 5,895 m, and studies of the standard 4–5 day ascents report altitude illness in roughly three-quarters of climbers. CDC recommends acetazolamide for most Kilimanjaro clients plus adding at least a day or two to the ascent — and notes that even on acetazolamide, some 40% still feel it. If Kili is on your itinerary, altitude prophylaxis joins the malaria plan.
The yellow-fever transit rule that catches people
Flying direct from the US, yellow fever vaccination is not an entry requirement for Kenya or Tanzania. But Tanzania requires proof of vaccination from travelers arriving from a yellow-fever-risk country — and that includes airport layovers over 12 hours in one. Route through Nairobi to Zanzibar and the paperwork question gets real. The vaccine itself is a certified-clinic injection; we’ll tell you plainly when your route triggers it.
The rest of the kit
East Africa sits in the high travelers’-diarrhea tier — standby azithromycin earns its place in the bag. Typhoid vaccination is CDC-recommended for most travelers to both countries; the injectable is a clinic item.
What a $49 consult typically covers here
- Atovaquone-proguanil (Malarone) — malaria chemoprophylaxis
- Azithromycin — travelers’ diarrhea standby (self-treatment)
- Acetazolamide — altitude illness prophylaxis
A typical safari plan centers on malaria prophylaxis + standby diarrhea treatment; Kilimanjaro adds the altitude conversation. Your physician composes the final plan for your exact route. Sources: CDC destination pages + Yellow Book 2026.