Dr Arturo Reyes-Sandoval tells us about his research on a vaccine against Plasmodium vivax. Dr Reyes Sandoval aims to develop a novel malaria vaccine against Plasmodium vivax, one of the four malaria parasites that affect humans. P. vivax is found in Africa, Asia, Latin America and the Western Pacific. 40 percent of the world's population is exposed to the disease that is responsible for around 130 to 350 million clinical cases every year.