Health
US eyes controversial human challenge trials for COVID-19 vaccine – Al Jazeera English
The synthetic strain would be used in studies where patients are purposely infected to test a vaccine’s efficacy.

US government scientists have begun efforts to manufacture a strain of the novel coronavirus that could be used in human challenge trials of vaccines, a controversial type of study in which healthy volunteers would be vaccinated and then intentionally infected with the virus, according to the Reuters news agency.
The work is preliminary and such trials would not replace large-scale, phase-three trials such as those now under way in the United States testing experimental COVID-19 vaccines from …
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