From Wikipedia:

Studies that are in vivo (Latin for "within the living"; often not italicized in English) are those in which the effects of various biological entities are tested on whole, living organisms or cells, usually animals, including humans, and plants, as opposed to a tissue extract or dead organism...

I assume that because it was tested with live virus cells. Such an exciting set of results!! Lots of great momentum for a strong IPO. This gives great credibility to both the process GNBT/NGIO has taken as well as the leadership Joe has shown to be patient and disciplined. Congratulations and keep it going