SEATTLE — Nov. 26, 2007 — Endemic cholera, a potentially fatal diarrheal disease found in the world’s most impoverished countries, could be effectively controlled by orally vaccinating half of the affected populations once every two years for only pennies per dose, according to new findings by an international team of researchers led by Ira M. Longini Jr., Ph.D., a biostatistician in the Vaccine and Infectious Disease Institute at Fred Hutchinson Cancer Research Center in Seattle. Longini and colleagues will report their findings online Nov. 27 in PLoS Medicine.