Eggs without chicken feces are not necessarily clean

Eggs without chicken feces are not necessarily clean


Eggs are rich in nutrients. As an essential ingredient in the kitchen, eggs are cheap, high-quality and nutritious. When buying eggs, we will find that some eggs are clean on the surface, while others are stained with chicken feces. Everyone will naturally avoid eggs with chicken droppings and choose eggs with a clean surface.

However, are eggs without chicken feces really clean? Not necessarily!

These are the “dirtiest” pathogenic bacteria in eggs

Hens lay eggs and defecate through the “cloaca”, and eggs and chicken feces always meet. Although eggs without chicken poop look clean, they may still carry some dirty things that we can’t see with the naked eye, which are pathogenic bacteria.

A survey shows that the total number of bacteria on the surface of eggshells is about 1.5 million. Although this number sounds scary, don’t be too afraid. In fact, bacteria exist in the environment. Our human body may have 10,000 to 1 million bacterial colonies per square centimeter, forming a number of bacteria ranging from unit to unit.

What we need to be wary of are the “dirtiest” pathogenic bacteria in eggs – including Staphylococcus aureus, E. coli and salmonella.

Researchers once tested commercial eggs in three areas: Fangshan District, Haidian District and Shunyi District in Beijing. The results showed that the detection rate of E. coli on the eggshells of eggs in the three regions was relatively high, with an average carriage rate of 80%; the average carriage rate of Salmonella was 15%; and the average carriage rate of Staphylococcus aureus was 5%.

Salmonella and E. coli can be detected on eggshells with obvious feces and dirt on the surface, and the number of colonies is larger. On the other hand, E. coli can be detected on eggshells with a relatively clean surface, and the number of colonies is small.

Eggs are contaminated after laying. Eggs with less surface contamination (eggs that look clean) will take a certain amount of time to be infected by microorganisms and reach the contents. Generally, if stored at 25°C for 3 days, salmonella can penetrate the eggshell. And the shell membrane infects the egg contents; for eggs with heavy surface contamination, microorganisms will multiply in a short period of time and invade the inside of the egg.

Salmonella needs to be vigilant, severe cases may cause death

Salmonella is a major foodborne pathogen commonly found in eggs, meat and raw milk.

Salmonella may contaminate eggs from the reproductive tissue of infected hens before the shell is formed, which can also contaminate the interior of the egg.

What’s even more frightening is that Salmonella is particularly easy to feed: it is salt-tolerant and low-temperature resistant, and can survive in dry environments for several weeks, in water for 3 weeks, and in feces for 2 months. Salmonella infection can cause abdominal pain, diarrhea, nausea, vomiting, and fever in mild cases, and may lead to death in severe cases.

my country’s survey data shows that among the many diseases caused by eating eggs, the proportion of illness caused by eating eggs contaminated with Salmonella can be as high as 70%-80%; it can be seen that we must be more vigilant about Salmonella and not take it lightly.

Tips for eating eggs safely

Although salmonella in eggs is dangerous, it is not difficult to deal with. When eating eggs, you can avoid its harm to the greatest extent by doing the following 6 things.

◎Purchase eggs

When buying eggs in the supermarket, choose eggs that are clean and have intact shells. Eggs with more contaminants on their shells and eggs with cracks are more likely to be contaminated by pathogenic bacteria, so it is best not to buy them.

◎Save eggs correctly

After you buy it home, you can store it in a cool and dry place, preferably in the refrigerator, and store it separately from fruits, vegetables, meat, etc. to avoid cross-contamination.

Under normal circumstances, purchased eggs do not need to be washed. This is because there is a protective film on the surface of the egg shell, which can reduce the entry of microorganisms into the inside of the egg. If you wash it too much, the protective film will be damaged. Even if you put it in the refrigerator, the egg will not Very easy to spoil. However, if there is a lot of chicken manure and soil on the surface of the eggshell, it can be cleaned. The cleaned eggs should be eaten first in a short period of time.

And it should be noted that eggs that have been refrigerated should continue to be kept at refrigerated temperature. Do not transfer previously refrigerated eggs to room temperature for storage. Because of the temperature difference, water droplets will form on the eggshell, which may help microorganisms enter the egg and make the egg easy to deteriorate.

◎Don’t keep it for too long

Don’t buy too many eggs at one time. It’s better to buy less and more often to avoid storing them for too long. Although there is a protective film on the surface of the egg, as the eggs are stored for longer and longer, the protective ability of this protective film will become weaker and weaker. Also, the longer eggs are stored, the more likely they are to become contaminated with salmonella.

◎Try not to eat soft-boiled eggs

Soft-boiled eggs tend to have softer egg whites, while the yolks are still liquid and flowable. In this state, the center temperature of the yolk may not reach above 60°C, which makes it difficult to kill Salmonella and may carry Salmonella and other bacteria, increasing the risk of food poisoning. In comparison, hard-boiled eggs are safer to eat.

◎Do not boil eggs with boiling water

Even if the eggs taken out of the refrigerator are washed with boiling water, they may not reach the temperature that kills salmonella. Moreover, they are basically stirred before drinking, so the time required for sterilization is almost not met. Such an operation cannot guarantee that all salmonella and other bacteria will be killed, and will increase the risk of food poisoning.

◎It is not recommended to eat raw eggs

Hairy eggs are eggs that “ga” off during the incubation process, which are stillborn eggs. May contain parasites and pathogenic bacteria such as salmonella, E. coli, and typhoid bacteria, which will increase the risk of food poisoning.



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