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Blog by Piero Olliaro, Professor of Poverty-Related Infectious Diseases and ISARIC Director of Science, following the publication - and retraction - of scientific articles about the risks of treating COVID-19 with (hydroxy)chloroquine. This calls for the reflection on how decisions are made, how the underlying ‘evidence’ is generated and disseminated, and how exposed and vulnerable to manipulation the system we rely upon is.

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