Both sides have something to gain. It may be muddled but I'm going to err on the side of caution and buy my pork from farmers that don't use these vaccines. Worst case, I'm spending more but supporting local small farmers. I can live with that. I don't trust that the human variant was tested enough or that it's safe. I don't see a reason that wouldn't also be the case for the livestock variant. The difference I suppose is that this was done pre-covid and involves far less money than the human variant. Still no reason to trust Merck or the technology.