Gain-of-function
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"Gain-of-function" research is the modification of naturally occurring viruses in order to make them more deadly and/or more contagious, especially in humans.
Temporary moratorium
Safety concerns lead to the banning of "Gain-of-function" research on coronaviruses in the US in 2014, but it "came roaring back under Trump and Fauci" in 2017[citation needed]. Marc Lipsitch commented that this sort of research had “done almost nothing to improve our preparedness for pandemics, yet... risked creating an accidental pandemic.”[1]