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Health✓ Verified CorrectPredicted 2011Verified 2019

Vaccination Programs Would Be the Highest-Return Investment in Global Development

What He Predicted

Gates argued in his 2011 Annual Letter that childhood vaccination was the single highest-return investment in global development — preventing diseases that were killing and impoverishing families across the developing world, and generating economic returns many times greater than the cost.

What Actually Happened

A 2019 study in Health Affairs found that vaccine programs between 2001–2020 prevented 20 million deaths in 73 low-income countries. The WHO documented a $44 return for every $1 invested in childhood immunization — one of the highest measured ROIs in the history of public health.

Source: https://www.gatesfoundation.org/ideas/annual-letters/annual-letter-2011

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