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Data from a large-scale clinical study conducted by Columbia University Irving Medical Center in the US showed that Covid-19 patients treated with hydroxychloroquine did not experience better performance than those who did not receive the drug.

Overall, 346 patients went on to develop respiratory failure, 180 were intubated and 166 died without intubation. The findings revealed that patients on hydroxychloroquine had the same risk of intubation or death as those who were not treated with the drug.