There are lots of unknown to be known. The Covid 19 is a new virus, it takes time and efforts for scientists and doctors to fully understand it and find ways to eliminate it.https://twitter.com/ChinaPlusNews/status/1248599449258975232 …
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“What we know about humans and of diseases is too shallow, and too little. How will the novel coronavirus evolve? We do not know.”says a doctor who participated in the battle against the pandemic in Wuhan. For more: https://apple.co/3aZQcPW 
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