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Exclusive: U.S. to make coronavirus strain for possible human challenge trials

CHICAGO (Reuters) – U.S. 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, Reuters has learned. A woman holds a small bottle labeled with a “Vaccine COVID-19” sticker and a medical syringe in this illustration taken April 10, 2020. REUTERS/Dado Ruvic/Illustration/FilesThe work is preliminary and such trials would not replace large-scale, Phase 3 trials such as those now under way in the United States testing experimental COVID-19 vaccines from Moderna Inc (MRNA.O) and Pfizer Inc (PFE.N), according to a statement emailed to Reuters by the National Institute of Allergy and Infectious Diseases (NIAID), part of the National Institutes of Health. U.S. officials organizing the fight against the pandemic have been under pressure from advocacy groups such as 1 Day Sooner and others that see challenge trials as a wa
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