Adrian Hill was in Farafenni, a town in the West African nation of The Gambia, meeting last winter with the local field staff working on a trial of his malaria vaccine. Most greeted him with grins, recalls Hill, but Modou Jallow's face was uncharacteristically long and his eyes sad. "I had a bad weekend," he said softly. continued...

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Reprinted from the HHMI Bulletin,
March 2003, pages 14–19.
©2003 Howard Hughes Medical Institute