A global immunization program has eliminated smallpox ​ — the lethal disease that claimed more lives than all the wars of the 20th century combined — ​ and a similar campaign has almost eradicated polio.
और इसी से मिलते - जुलते एक और अभियान ने पोलियो का करीब - करीब नामो - निशान मिटा दिया है ।