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2019 ncov, background, biology, blue, cell, china, close up, contagious, coronavirus, covid 19, covid19, danger, disease, epidemic, flu, global, health, healthcare, illness, infection, influenza, isolation, medical, medicine, merc, microorganism, microscopic, ncov, outbreak, pandemic, prevention, protection, quarantine, research, respiratory, risk, sars, science, symptom, treatment, vaccine, virus, world, wuhan,