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2019ncov, africa, b11529, classification, corona, corona virus, coronavirus, covid, covid19, covid19 variant, delta, disease, doctor, epidemic, equipment, evolution, hand, health, illness, infection, kit, laboratory, mask, medical, mutation, new, omicron, omicron variant, pandemic, positive, reinfection, risk, south africa, test, travel, vaccination, vaccine, variant, virus, world health organization,