Abdel Gawad Ellabbad knows exactly how he was infected with hepatitis C. As a schoolboy in this Nile Delta rice-farming village, his class marched to the local clinic every month for injections against schistosomiasis, a parasitic disease spread by water snails. Six million Egyptians were infected with hepatitis C by unsterile needles during the country's decades-long fight against schistosomiasis. The virus spread insidiously; today, at least 10 percent of Egyptians, nearly nine million people, are chronically infected, the highest rate in the world. But a grand experiment unfolding across the country may change all that. Pharmaceutical companies are testing ... a complicated deal to sell hepatitis drugs at a fraction of their usual cost. If [successful] the arrangement in Egypt may serve as a blueprint not just for curing hepatitis around the world, but also for providing other cutting-edge medicines to citizens in poor countries who could never afford them. The experiment here is about a year old and, while still fragile, appears to be headed for success. Mr. Ellabbad, for one, was finally cured of hepatitis this spring. An air-conditioning repairman, he took a three-month regimen that included sofosbuvir, first of the new generation of miracle drugs. The pills would have cost more than $84,000 in the United States. He got them free from the Egyptian government, which paid about $900. "Before, I felt like I was dying," he said. "Now I feel like I've never felt before. Like I'm 35 again."