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abstract, b11529, background, biology, cell, concept, corona, coronavirus, covid, covid19, danger, dangerous, disease, epidemic, fever, flu, health, hiv, illness, immunity, infection, isolated, medical, medicine, microbe, microbiology, microscopic, mutation, news, omicron, omicron variant, outbreak, pandemic, prevention, protection, quarantine, red, research, sars, sarscov2, science, south africa, strain, test, text, vaccine, variant, virology, virus, white,