In Britain, it’s common to find egg cartons being sold and stored at room temperature. However, storage practices vary depending on how each country manages salmonella.
There are two main schools of thought when it comes to fighting salmonella in eggs: washing eggs and vaccinating chickens. Countries that wash eggs will refrigerate them.
For countries that vaccinate their egg-laying hens, eggs can be left at room temperature. Neither country experiences mass-scale safety issues, making both methods fairly reliable.