Leaving eggs out of the refrigerator for 5 hours does increase the risk of bacterial growth, including the potential for salmonella. However, the presence of salmonella would not be limited to just the egg carton. If there were any harmful bacteria present on the eggs when they were left out, it is possible that some could have transferred to the surrounding environment inside the fridge.
Salmonella is a type of bacteria commonly found in raw and undercooked eggs, as well as on their shells. When eggs are stored at room temperature for an extended period, the conditions become more favorable for bacteria to multiply. Refrigeration slows down bacterial growth, which is why it is essential to store eggs in the fridge.
The best course of action now is to ensure the eggs are kept in the refrigerator and used within their expiration date. Additionally, you should clean and sanitize the areas in the fridge where the egg carton was placed. This minimizes the risk of cross-contamination with other foods in the fridge.
It's important to note that not all eggs will necessarily contain salmonella, but the risk is present. To reduce the risk of foodborne illness, always follow food safety guidelines and store perishable items properly. If you are concerned about your health, monitor yourself for any symptoms of food poisoning and seek medical attention if needed.