John Campbell Discusses That Lab-Engineered COVID Virus That Kills 80% of Lab Mice

Here's the paper, from Boston University School of Medicine, which John Campbell discusses in this video:

Abstract 

The recently identified, globally predominant SARS-CoV-2 Omicron variant (BA.1) is highly transmissible, even in fully vaccinated individuals, and causes attenuated disease compared with other major viral variants recognized to date1–7. The Omicron spike (S) protein, with an unusually large number of mutations, is considered the major driver of these phenotypes3,8. We generated chimeric recombinant SARS-CoV-2 encoding the S gene of Omicron in the backbone of an ancestral SARS-CoV-2 isolate and compared this virus with the naturally circulating Omicron variant.

As John Campbell says, "This is, surely, Gain-of-Function Research." 

OH, AND BY THE WAY:

Former EcoHealth VP and Whistleblower Andrew Huff: US Govt. Is Trying to Cover Up Origins of COVID-19 Because Dr. Fauci and US Were Funding Wuhan Lab’s Gain of Function Research (VIDEO)