Why Do Some Countries Chill Their Eggs While Others Leave Them Out?

Eggs come with a built-in protective layer called the cuticle, which prevents bacteria from entering through the shell. In many countries, particularly in Europe, eggs are not washed after being laid, allowing this natural barrier to remain intact. As a result, eggs can be safely stored at room temperature without the risk of contamination.

However, in places like the United States, eggs are washed and sanitized to remove dirt and potential bacteria. While this process makes eggs appear cleaner, it also strips away the cuticle, leaving the shell more porous and vulnerable to bacteria like Salmonella. To compensate, these eggs must be refrigerated to slow bacterial growth and keep them safe to eat.

Salmonella Prevention: Refrigeration vs. Vaccination

Another key difference is how countries prevent Salmonella contamination. In Europe, hens are routinely vaccinated against Salmonella, reducing the risk of infection at the source. Since unwashed eggs still have their cuticles, they don’t require refrigeration.

In contrast, the US focuses on washing eggs to remove bacteria from the shell, but because this process weakens their defenses, refrigeration is essential. This difference in approach explains why eggs in some countries are stored at room temperature, while in others, chilling them is mandatory.

Infrastructure and Consumer Habits

Aside from food safety, refrigeration practices are influenced by climate, infrastructure, and consumer habits. In countries with hotter climates but limited access to refrigeration, keeping eggs unwashed ensures they last longer without spoiling. On the other hand, in nations where refrigeration is standard in homes and supermarkets, keeping eggs cold is a simple and effective safety measure.

It’s also important to note that once eggs are refrigerated, they must stay that way. Moving them from cold to warm environments causes condensation, which can create a breeding ground for bacteria.

Ultimately, egg storage methods vary depending on how a country handles food safety. Unwashed eggs with their natural cuticle can stay at room temperature, while washed eggs must be kept cold to remain safe. Whether you refrigerate your eggs or not, the key is to follow local food safety guidelines to keep them fresh and free from contamination.