Malaria and not maleria!!!
I lived in Kenya for 6 months quite some time ago.
The fact is that if you know Malaria you can survive....
1- is transmitted by a Mosquito, female and pregnant... that sting around sunset till 9 pm.
2- if you use mosquito repellent and use long sleeve and long pants you will be very safe.
3- use air conditioning in your room and sleep under a mosquito net.
4- do not take any Malaria tablets that are not effective 1005 and will distroy your liver!!! I saw people suffering like hell cause they were taking this tablets.
5- the period of incubation is up to 40 days, so if after coming back from a place where Malaria is possible just go to the closer hospital\doctor and make blood analisys.
When I go to malaria infected places I'm so carefull that usually I never get even stung once by mozzis.