The Ethics of Using Animals for Medical Experiments

Hundreds of millions of animals each year are used in medical lab based experiments we can indeed thank the inventors of the various covid vaccines for using animals to make sure that those vaccines were safe for humanity. I'm not absolutist about animal experiments there are some circumstances in which maybe the the benefits are so great and there is no other way of doing it  and the harms to animals are absolutely minimized would the race to find covid vaccines be one of them well at some stages but in fact in the race to finds safe covid vaccines the research community did not make use of thousands tens of thousands of volunteers who wanted to be challenged themselves.