SARS-CoV-2 Coronavirus Variant Omicron cell delta on green background 2021 2022. SARS-CoV-2 Coronavirus Omicron B.1.1.529. cell delta. South Africa Coronavirus variant. Sizes: 150 × 150 / 300 × 200 / 768 × 512 / 1,024 × 683 / 1,200 × 800