The vaccine they were testing was derailed when participants reported behaviours that resemble anti-vax talking points now. It killed the human testing in the final stages at a huge commercial loss.

But if you go to the vet and get a vax for a big dog and it accidentally gets into your arm and not Rover’s paw, that’s the same thing. They repurposed the ‘failed’ vax for use in pets.

Or so I heard. Go confirm.