First human challenge study of Covid-19 yields valuable insights about how we get sick
CNN
It takes just a tiny virus-laden droplet -- about the width of a human blood cell -- to infect someone with Covid-19.
That's just one of the findings from research that deliberately infected healthy volunteers with the SARS-CoV-2 virus. The findings were published Thursday in the journal Nature Medicine.
Challenge studies can be controversial because they involve intentionally giving someone a virus or other pathogen in order to study its effects on the human body. Even with safeguards in place, there's an element of risk, particularly when studying a new virus.
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