As the WHO warns the coronavirus is reaching a dangerous tipping point.
With inside footage of China's quarantined cities, and of the top security lab where scientists are battling the pathogen, this report has unprecedented access to the residents, doctors, and journalists describing how the coronavirus originated in a Wuhan seafood market and spread around the world. As China began to act, it was too late - the virus was halfway around the world. Scientist Trevor Drew, whose team isolated the virus, says we still know little about how to stop it: "We don't actually know how dangerous this is. We don't know exactly what the mechanism is by which this virus kills people".
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