“Seriously effective, but it’s just an antiviral, not a vaccine.”
You aren’t using ‘antiviral’ properly. An antiviral is Tamiflu. Remdesivir is another. Regeneron is a monoclonal antibody, as you see it invariably described.
It's a combination of two monoclonal antibodies that functions as an antiviral agent against the COVD-19 virus. I wonder if we could stop splitting hairs?