When it comes to vaccinating livestock (and I now classify humans as livestock, having lost any privileges that previously separated them from other species) I like to point to Hendra vaccine for horsies.

https://www.theatlantic.com/science/archive/2018/07/anti-vaxxers-horses-hendra/559967/

https://www.abc.net.au/news/rural/2018-03-21/classs-action-launched-against-hendra-vaccine-makers/9572480

When it comes to vaccinating livestock (and I now classify humans as livestock, having lost any privileges that previously separated them from other species) I like to point to Hendra vaccine for horsies.

https://www.theatlantic.com/science/archive/2018/07/anti-vaxxers-horses-hendra/559967/