In June, The Lancet retracted a major study based on a massive data set.
The study suggested that the drug hydroxychloroquine actively harms COVID-19 patients. But critics highlighted irregularities in the numbers, some of the study’s own authors were unable to audit the data to investigate the concerns, the company that claimed to have collected the information from thousands of hospitals did not appear to have the infrastructure and resources necessary to have done so, and several major hospitals in Australia whose participation would have been needed to make the numbers work told the Guardian they had not been involved. The New England Journal of Medicine had to pull a different study based on the same data.
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