While randomized double-blind tests have become the gold standard for testing of various hypotheses, they also raise some ethical questions for which there are no easy answers. In the case of the covid-19 vaccine trials, there were discussions as to when the study should be unblinded so that those in the placebo group could also be vaccinated. Commenter Bethany said that a co-worker was in the Pfizer study and told her that it has been unblinded.
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