Alfred Sommer is a prominent American ophthalmologist and epidemiologist at the Johns Hopkins Bloomberg School of Public Health. His research on vitamin A in the 1970s and 1980s revealed that dosing severely vitamin A deficient children with an inexpensive, large dose vitamin A capsule twice a year reduces child mortality by as much as 34 percent. The World Bank and, recently, the Copenhagen Consensus list vitamin A supplementation as one of the most cost-effective health interventions in the world.
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