You will need to provide an International certificate of vaccination or prophylaxis (ICVP) (yellow fever certificate) if travelling from a yellow fever endemic country.
There is a very low risk of malaria in Nairobi, the areas immediately around Nairobi, and in the highlands above 2,500m. Malaria tablets aren't recommended if you are only travelling to these areas, but you should take precautions and practise insect bite avoidance to reduce your risk.
VISA REQUIREMENTS
All visitors who intend to travel to the Republic of Kenya must have an approved Electronic Travel Authorisation (eTA) before the start of their journey.
Persons who are exempt from obtaining the Electronic Travel Authorisation (eTA): Citizens of the East African Partner States; These countries include Burundi, Democratic Republic of Congo, Rwanda, South Sudan, Tanzania and Uganda (Exempted for Six (6) months)