I lived in a Malaria prone area for 13yrs and only got it 4 or 5 times,both kinds ie Vivax and Falsiparam (spelling?).
I agree with the chap who states " don't worry about " as nothing will stop you getting it , only lessen the severity of the attack and it has no effect on your class 1.
If you do get symptoms ,ie headache,sweats,chills etc go to your doctor asap as the Falsiparam (cerebral malaria ) will kill you after a week or so !
The last time I had it I was given a Quinine injection put on a week of quinine tabs followed by a Fanzidah tablet which wipes the the bug from your system and makes you feel crap for a day or so in the process , worse than the malaria .
Hope this helps !
MM.