As we have taken diarrhea and pneumonia down, even malaria down quite a bit, the portion of the days that are very early in that 5 years – the first month, the first day – it’s about half now. Yet that’s the part we understand the least.

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As we have taken diarrhea and pneumonia down, even malaria down quite a bit, the portion of the days that are very early in that 5 years – the first month, the first day – it's about half now. Yet that's the part we understand the least.