Political support is building for regulators in the United States to embrace the controversial strategy of intentionally infecting volunteers with the virus that causes COVID-19 in order to test experimental vaccines. Such human challenge trials could greatly accelerate the development of an effective vaccine, 35 members of the House of Representatives argue in a letter sent yesterday to the heads of the U.S. Food and Drug Administration (FDA) and its parent agency, the Department of Health and Human Services (HHS).

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