In many Latin American countries, eggs are stored at room temperature in grocery stores. Unwashed eggs retain a protective cuticle that keeps bacteria out — no refrigeration needed.
Walk into a grocery store in Mexico, Colombia, Argentina, or most of Latin America and the eggs will be sitting on an unrefrigerated shelf, often near the bread or dry goods, stacked in open cardboard flats. To a visitor from the United States, this looks like a food safety oversight. It is not. It is the result of a different approach to egg handling that preserves a natural protective mechanism the American system removes. The science is straightforward, the policy implications are significant, and the debate between the two approaches has been ongoing in food safety circles for decades.
## The Cuticle: What It Is and Why It Matters
A freshly laid egg is covered in a thin protein coating called the cuticle, also known as the bloom. The hen deposits this coating during the final stage of egg formation, as the egg passes through the uterus. The cuticle seals the approximately 8,000 pores in the eggshell, preventing bacterial infiltration and reducing moisture loss. An egg with its cuticle intact is significantly more resistant to Salmonella contamination than one without it.
The United States washes commercial eggs with warm water and detergent immediately after collection. This removes fecal matter, dirt, and surface contamination, but it also removes the cuticle. Once the cuticle is gone, the shell's pores are open. If the washed egg is then stored at room temperature, bacteria on the surface can enter the egg and multiply rapidly. This is why American regulations require refrigeration of commercially sold eggs from the point of washing through retail sale and home storage.
Latin American countries, along with the European Union, Australia, New Zealand, and Japan (with its own additional protocols), take the opposite approach. Eggs are not washed commercially. The cuticle remains intact. Room temperature storage is safe because the shell's natural defense is preserved. The trade-off is that the shell surface may carry more visible contamination, but internal bacterial load is controlled by the cuticle rather than by the cold chain.
## Policy Divergence and Trade Implications
The United States and European Union have been on opposite sides of this issue since at least the 1990s, and the disagreement has had trade implications. EU regulations prohibit the sale of washed eggs in retail settings, on the grounds that washing removes the cuticle and creates a product that is more, not less, vulnerable to contamination if not kept cold. American regulations require washing and refrigeration. An American egg producer cannot legally export to the EU without modifying their processing approach. An EU producer selling in the United States faces the same problem in reverse.
This regulatory divergence is not primarily about which system produces safer eggs. Studies have found comparable Salmonella risk in both systems when each is followed correctly. The real issue is that the two approaches are incompatible: a washed egg must be refrigerated, an unwashed egg should not be washed by the consumer, and mixing handling protocols creates the conditions for contamination.
Latin American food safety agencies have generally followed the European model, preserving the cuticle and relying on room temperature storage. Street markets, small farms, and large commercial producers in the region use the same basic approach. Eggs move from farm to market to kitchen counter without refrigeration, and contamination rates, when production is handled correctly, remain acceptable.
## Home Handling and Consumer Behavior
The practical consequence for consumers in Latin America is a different relationship with eggs at home. Eggs sit in a bowl on the counter, used within a week or two of purchase. There is no scramble to move eggs from bag to refrigerator. The eggs bought at a farmers' market or corner store may be one to three days old, fresher than most refrigerated commercial eggs in American supermarkets, which can be several weeks old by the time of purchase.
Consumer education in Latin America accordingly emphasizes buying frequently and using promptly, rather than refrigerating and storing for extended periods. The egg, in this model, is a fresh product treated like bread: bought often, used quickly, not engineered for long shelf life through cold storage.