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A scientist holds a blood sample in a laboratory at the Center for Scientific Research Caucaseco in the outskirts of Cali, Colombia, on April 25, 2012, during the World Day for the fight against malaria. After Colombian physician Manuel Elkin Patarroyo developed a vaccine against malaria in 1986, Colombian scientists keep researching for another immunization for the illness, which in 2010 caused over 855.000 deaths all over the world. A team of 40 scientists is preparing to begin the second phase of chemical tests for a synthetic vaccine against malaria. Malaria is caused by the Plasmodium vivax and Plasmodium falcitarum parasites, and is transmitted by mosquitoes.  AFP PHOTO/Luis ROBAYO        (Photo credit should read LUIS ROBAYO/AFP/GettyImages) AFP/Getty