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Isolation of SARS-CoV-2 five days post-inoculation of Vero E6 cells. [A] Mock-infected Vero E6 cells. [B] Cells inoculated with material from PCIS filter A. [C] and [D] Cells inoculated with material from PCIS filter D. Images A, B, and D were photographed at an original magnification of 200×, whereas image C was photographed at 100×.
