Rna shots are faster to make. They could have made it as a traditional vaccine. The traditional vaccine was tested years ago and it actually worked. All the animals died because animals need covid cells.... That's how the common cold works. The virus tricks your body into making the virus rather than similar cells until you're immune system eliminates it. Some covid cells make you sick some don't.

The mRNA short was not tested for more than a couple months in 2020.