It's not merely polemic to note that all diseases that affect primarily the poor are, by definition, neglected. Cholera offers an object lesson: one hundred fifty years after John Snow took the handle off the Broad Street pump, more than a century after his suspicions of bacterial origin were confirmed, 60 years after antibiotic therapy was discovered, and 30 years after a safe and effective oral vaccine was developed, cholera remains—among the world's poorest—a leading infectious killer.That is Paul Farmer and Louise C. Ivers in the article "Cholera in Haiti: The Equity Agenda and the Future of Tropical Medicine" published in the American Journal of Tropical Medicine and Hygiene. Thought provoking . . .
Michael Kremer and Rachel Glennerster have written about this in their book Strong Medicine: Creating Incentives for Pharmaceutical Research on Neglected Diseases. From the book review in amazon: