Thanks everyone for your contibutions.
Regarding the previous reply about the person who "got it twice", I am suprised. I knid of thought that Malaria was something that once you got it, it would rear its ugly head now and again and general a fair few problems.
My question now is, Is it common for people of European decent (ie with no natural immunity) to "get it" and still continue to be employed as pilots (JAR Class 1 Medical) ?
I had simply just assummed that it would spell the end of a career in flying..