English: The proportions of patients experiencing successive P. vivax relapses taken from eight different clinical series: These were US soldiers with vivax malaria acquired in the South Pacific (2 series) [49,76], German soldiers who acquired vivax malaria in Greece [41], US soldiers with vivax malaria acquired in the Mediterranean area (two series)[45,47]and Italy[156], patients receiving malaria therapy with a local "strain" in Moscow [28], British patients receiving malaria therapy with the Madagascar strain [24,25], patients receiving malaria therapy with the McCoy strain in the United States [93], volunteers infected with the Chesson strain in the United States [75] and children followed prospectively in an evaluation of an ineffective malaria vaccine (SPf66) in northwestern Thailand [157]. Inset shows proportions on a log scale and numbers of patients studied.