This. This is why there's an episode of Bob's Burgers about their daughter lying at school about the funeral parlor next to the burger shop and her dad's food having corpses in it and the FDA investigating the restaurant because it potentially had more than 0.4% (?) of human flesh content. Why any at all? At such a small amount it's impossible to detect, completely safe to consume, and would be well less than a single finger in literal tons of hamburger. It's gross, but you'll be fine just like you have so far.

That, and farmers have to drink milk too; if there was pus in the milk, they'd care enough to do better, and they do because that's why we give cows antibiotics sometimes.

Now, if the government decides to loosen all those regulations, THEN I'll be worried.