[Lalabadie]

Any country where eggs are industrially washed before showing up in grocery stores.

Their protective coating (called the bloom, I believe?) goes away when that happens, and they become susceptible to salmonella when they stay at room temperature.

[ndsipa_pomu]

What's the reasoning behind washing eggs to make them more susceptible to salmonella?

[MrDOS]

Because it cleans the poop off.

[andai]

So if an egg has poop on it, it's less likely to have salmonella?

[lostlogin]

There is a coating on the outside of the egg which prevents that.

Washing the egg removes the poo and the coating.

No source provided and this may just be some myth.

[quesera]

It's true. The bloom on the eggs protects them from whatever nastiness is on the outside.

This includes salmonella, which may be present if your flock is infected in the poop on the outside of the shell (remember hens only have one egress port), plus any other sources of environmental pathogens, of which there are many.

When the bloom is washed off the egg, pathogens have an easier time penetrating the shell and consuming the nutritious yummy bits inside. At room temperature, they can multiply rapidly. Refrigeration slows the rate of growth.

An unwashed egg retains the barrier, and stays fresh longer without refrigeration.

YMMV on household acceptance of dirty eggs on countertops, but they are cleaner than many other items within arms' reach that we are conditioned to not think about. :)

[ndsipa_pomu]

I happily keep eggs in the box on my kitchen worktop for maybe a couple of weeks without them going bad. They'll happily last longer, but the eggs won't be at their best.

Incidentally, I heard somewhere that using a ridge to crack eggs on (like the edge of a frying pan) isn't best as that can possibly drive a bit of poopy shell into the interior though if it's just about to be cooked and eaten then that's less problematic. I use the flat kitchen top to crack the shell instead which leads to the occasional amusing outcome of cracking it too hard and dumping the whole egg onto the worktop.