https://www.statnews.com/2020/11/12/...s-complicated/
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“If you received the placebo, you may be offered the study vaccine at no cost if and when the study vaccine has been shown to be safe and that it works, but it is possible that this may not occur until 2 years after vaccination,” the J&J document reads. “This will be determined after consultation with the national health authorities in your country.”
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The study completion date for AstraZeneca is years out with the primary completion date of March 2021.
https://clinicaltrials.gov/ct2/show/NCT04516746