Can scientists rid malaria from the Third World by simply feeding algae genetically engineered with a vaccine?

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Apparently not yet.

But scientists say that a vast assortment of viral and bacterial diseases can be prevented by feeding algae orally as a vaccine.
The researchers fused a protein that provokes an antibody response in mice against the organism that causes malaria, Plasmodium falciparum, with a protein produced by the bacteria responsible for cholera, Vibrio cholera, that binds to intestinal epithelial cells. They then genetically engineered algae to produce this two-protein combination, freeze dried the algae and later fed the resulting green powder to mice.
The mice developed Immunoglobulin A (IgA) antibodies to both the malarial parasite protein and to a toxin produced by the cholera bacteria. IgA antibodies are produced in the gut and mucosal linings. Very interesting and ground breaking work is at hand here!