Infectious Diseases: 100 Million Vaccinations

Little Yaa Ansah Asamoa Ampofo, aged 3½, was chosen for her role as carefully as a poster girl. Under a blazing sun in Mampong Akwapim, near Ghana's capital of Accra, the brass band played fortissimo. Then the drums beat. Then there were speeches in English, French and the local language, Twi. At last Yaa was handed up to the platform, where a technician stood poised with his jet gun. He placed it against Yaa's arm and pressed the pedal trigger. Yaa opened her mouth in a gap-toothed smile.

By the best available statistics, Yaa was the 25 millionth West...

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