• More than 16,000 people have expressed willingness to be deliberately infected with the novel coronavirus to try to help bring about a vaccine faster. 
  • The method of deliberately exposing people to a virus to test the effectiveness of a vaccine is called a human challenge. 
  • There are ethical hurdles: The World Health Organization has previously said such methods could be effective but should not be used with pathogens that have high fatality rates and no cures or treatments. 
  • The US Food and Drug Administration so far has not approved human-challenge trials for a COVID-19 vaccine. 
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More than 16,000 people have shown interest in volunteering to try to speed up vaccine development for the new coronavirus by being intentionally infected with the virus, CNN reported this week.