PARTICIPANTS of a clinical trial that will determine if the oral antiviral drug molnupiravir can prevent transmission of Covid-19 must be unvaccinated and should have only one Covid positive patient in his household.

The third phase of the trial, announced by Merck and Ridgeback Laboratories who developed the oral antiviral pill, aims to determine if molnupiravir is effective in preventing Covid-19 infection to those who took it as an oral prophylaxis.

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