Eggs at Room Temperature?

On a recent trip to Mexico I noted that, unlike the U.S., eggs were not refrigerated when sold in stores. I wondered why. Apparently many other countries vaccinate hens for salmonella. The vaccination is not required in the US. Since over 100,000 people are sickened with salmonella each year, it is an easy safeguard to refrigerate eggs. Apparently the shelf life of a room temperature egg decreases quickly when compared to refrigeration. Most sources said seven days. I am sure we've never eaten a dozen eggs in seven days.