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Coronavirus covid-19 Omicron variant. B.1.1.529 mutation virus cell 3D medical illustration background. Africa corona virus strain 2019-ncov sars. Mutated omicron coronavirus SARS-CoV-2 flu disease; Shutterstock ID 2083417909; purchase_order:DPG Bulk Purchase February 2022; job:MHHE selections; client:McGraw-Hill Education; other: