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Growth kinetics of SARS-CoV-2 isolates in cell culture. VeroE6, VeroE6/TMPRSS2, Calu-3, A549, NCI-H322, and NCI-H358 cells were infected with viruses at an MOI of 0.05. The supernatants of the infected cells were harvested at the indicated times, and virus titers were determined by means of plaque assays in VeroE6/TMPRSS2 cells. Error bars indicate SDs from three independent experiments.
