Malaria is one of the most successful diseases in killing humans.
About 45 percent of the world's population are at risk of getting malaria, according to the World Health Organization. To date no vaccine available has been developed that the Plasmodium parasites, which cause malaria, have not developed a resistance to. Scientists are currently working on a DNA vaccine, which will stimulate the body's immune system defenses. DNA vaccines contain a single gene from a pathogen. This gene is inserted into a bacterial DNA plasmid.