Volume 26, Number 9—September 2020
Research
Isolation, Sequence, Infectivity, and Replication Kinetics of Severe Acute Respiratory Syndrome Coronavirus 2
Figure 2
![Isolating severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from patients with coronavirus disease (COVID-19). A) Vero E6 cells were mock inoculated or inoculated with midturbinate clinical specimens from COVID-19 patients. Cells were incubated for 72 h and observed for cytopathic effect (CPE) under a light microscope. Original magnification ×10. B) To determine if supernatant from Vero E6 cells that were mock inoculated or inoculated with clinical specimens contained replication comp](/eid/images/20-1495-F2.jpg)
Figure 2. Isolating severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) from patients with coronavirus disease (COVID-19). A) Vero E6 cells were mock inoculated or inoculated with midturbinate clinical specimens from COVID-19 patients. Cells were incubated for 72 h and observed for cytopathic effect (CPE) under a light microscope. Original magnification ×10. B) To determine if supernatant from Vero E6 cells that were mock inoculated or inoculated with clinical specimens contained replication competent virus, we reinoculated a fresh monolayer of Vero E6 cells and observed cells under a light microscope for CPE after 24 h. Original magnification ×10. C) Quantitative real-time PCR was used to detect SARS-CoV-2 5′-UTR and E gene in RNA extracted from supernatant that was collected from Vero E6 cells that were mock infected or infected with clinical specimens from COVID-19 patients for 72 h. D) Electron micrograph of Vero E6 cells that were reinfected for 48 h with supernatant that was collected from Vero E6 cells infected with clinical specimens. Original magnification ×36,000. Inset, zoomed and cropped from the original electron micrograph, shows coronavirus-like particles. M, mock specimen; specimen 1, SARS-CoV-2/SB2; specimen 2, SARS-CoV-2/SB3-TYAGNC. E, envelope; UTR, untranslated region.
1These authors contributed equally to this article.