For those who didn't read the full paper, their isolate was determined using an RT-PCR.
2.3. Detection of SARS-CoV-2 using a TaqMan Real-time RT-PCR assay
The RT-PCR cannot distinguish SARS-CoV-2 from other coronaviruses nor influenza A or B. As Ivermectin was previously determined to be an effective treatment of influenza A and B, it should come as no surprise that samples deemed positive by RT-PCR failed to replicate.
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