Sorry, but this is absolutely absurd to claim. Are you actually suggesting that keeping animals in cramped, filthy conditions, surrounded by dead baby animals covered in feces (ex. pigs in farrowing crates), is less likely to facilitate disease growth than growing romaine lettuce?

Edit: I re-read your comment and saw you were referring to food POISONING - but I'll still maintain my point here. Fact of the matter is, food poisoning is not contagious and is fairly rare, and there are machines in place for product recalls, etc. What we have at the moment is a global pandemic started by the close quarters of animals. Which one would you rather deal with?

And the reason it's more common to get salmonella or e-coli from plants is because they are eaten raw (lettuce or broccoli or carrots, etc); this doesn't mean meat isn't contaminated with it. It just gets "cooked off" because you heat meat (or pasteurize dairy).