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2019ncov, alert, attention, biohazard, biology, chinese, concept, contagious, corona, coronavirus, covid, covid 19, covid19, danger, dangerous, design, diagnosis, disease, epidemic, fever, flu, global, health, hospital, illness, illustration, infection, influenza, isolated, medical, medicine, outbreak, pandemic, pneumonia, protection, quarantine, respiratory, risk, sickness, sign, stop, symbol, vaccine, virus, warning,