Some more thoughts on malaria:
the doctor at the Exotic Diseases Center here in Hungary said that the usual antimalaria drugs that they recomend for tourist can put you in a nonflying situation. Side effects like nausea, even minor hallucination are a nogoer if you want to be in command. not to mention that on longterm they cause serious liver and other problems.
It is better to carry Coartem. In case you get malaria this will cure you in a few days. Also in Botswana it seems that malaria is not a big thread. I checked with a fellow Hungarian flying in Chad and Congo who's had malaria 2 years ago. He also used Coartem. Later never had problems again.
Maun guys told me that it is up to you what shots you get but those are mainly a waste of money. And these things agree with what the guys said here above. Have a net and spray yourself.