Malaria

Julia Kubanek a chemical ecologist at the Georgia Institute of Technology identified a seaweed, a red alga, Callophycus Serratus, in the oceans around Fiji that prevents the Malaria parasite from living and reproducing inside of red blood cells.

Maybe that's why Malaria is not a problem in the Fiji Islands. I thought it was the Kava.
http://news.sciencemag.org/sciencenow/2011/02/seaweed-a-source-of-potential.html?ref=hp