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Scientists have been playing a lethal game of cat and mouse with the novel coronavirus. Each time we learn a little more about COVID-19, it adapts and mutates into a new strain, affecting transmission, diagnosis, treatment and vaccination development.

Studies have found hundreds of mutated versions of the novel coronavirus in infected patients, with some more severe and more contagious than the original one.

In fact, there’s a lot we don’t know about COVID-19 -- arguably, what we don’t know outweighs what we do. Some of the biggest questions overshadowing the virus concern origin and spread, symptoms and immunity.