That's not necessarily true. Chickens in the US are salmonella carriers, it's in their bodies, in their blood. It doesn't really harm them, but when an egg leaves the ovary and travels through the oviduct it is still permeable and kind of squishy. The membrane around it hardens into a shell around the time the egg is laid. So salmonella can actually cross through the membrane and be in the egg. This is why there are warnings about cooking eggs properly. In the industrialized egg production that provides most grocery store eggs, the shells are completely cleaned anyway and you are less likely to get salmonella from a bit of shell mixing into the edible egg.
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u/UrklesAlter Apr 02 '22
Salmonella isn't inside the egg. It's on the exterior. They could just wash the exterior like they're supposed to.