The cold-water step helps prevent continued cooking and makes peeling easier.
10. Can a Fresh-Looking Egg Still Contain Salmonella?
This is one of the most important food-safety questions.
Yes. An egg can look completely normal and still contain harmful bacteria.
Salmonella is a major food-safety concern associated with eggs.
The bacteria can sometimes be present inside an egg before the shell forms. They can also contaminate the outside of the shell through contact with the hen's environment.
This means that visual inspection cannot guarantee that an egg is free from Salmonella.
The chalaza does not indicate whether bacteria are present. Neither does the color of the yolk, the clarity of the egg white, or the appearance of the shell.
Possible symptoms of Salmonella infection include:
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Diarrhea.
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Fever.
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Stomach cramps.
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Nausea.
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Vomiting.
Symptoms commonly begin within several hours to several days after exposure, although timing can vary.
Most healthy people recover, but some infections can become serious. Young children, older adults, pregnant people, and individuals with weakened immune systems are at greater risk of complications.
This is why proper egg handling and cooking matter much more than whether a white strand is visible.
11. How Should You Cook Eggs Safely?
Cooking eggs thoroughly is one of the most effective ways to reduce the risk of foodborne illness.
For ordinary home cooking, a practical rule is to cook eggs until both the yolk and white are firm.
Examples include:
Fried eggs: Cook until the white is completely set and the yolk reaches a safe level of doneness.
Scrambled eggs: Cook until they are firm rather than leaving them visibly runny.
Boiled eggs: Cook until the yolk is firm if following the most cautious approach.
Egg-based dishes: Cook casseroles, quiches, and similar dishes thoroughly. A food thermometer can help confirm that the center reaches a safe temperature.
For egg dishes, a temperature of 160°F (71°C) is a commonly recommended food-safety target in US guidance.
Some recipes intentionally use raw or lightly cooked eggs, including homemade mayonnaise, certain desserts, and sauces. For these dishes, pasteurized eggs or pasteurized egg products are a safer choice.
People at higher risk of foodborne illness should avoid raw or undercooked eggs unless pasteurized products are used according to the manufacturer's instructions.
Remember that cooking does not make an egg safe if it has already been badly spoiled or contaminated through improper handling. Start with eggs from a reliable source and store them correctly.
12. How to Store Eggs Correctly at Home
Storage conditions play an important role in maintaining egg quality and reducing bacterial growth.
In countries where eggs are sold refrigerated, keep them refrigerated after purchase.
A refrigerator temperature of 40°F (4°C) or below is commonly recommended in US food-safety guidance.
In practice, several simple habits can help:
Keep eggs in their original carton.
The carton helps protect the shells from damage and reduces exposure to odors from other foods.
Store eggs in a stable, cold part of the refrigerator.
The refrigerator door experiences more temperature changes because it is opened frequently. A shelf inside the refrigerator is generally more suitable.
Avoid leaving eggs at room temperature for long periods.
If refrigerated eggs have been left out for more than two hours, food-safety guidance generally recommends discarding them. In very hot conditions above 90°F (32°C), the recommended limit is one hour.
Do not wash eggs immediately before storage unless necessary and appropriate for the local egg-handling system.
Washing can remove the natural protective coating on the shell if it is not done correctly. In countries where eggs are commercially washed, refrigeration is particularly important.
Keep cracked eggs covered and refrigerated.
If you crack eggs in advance, place them in a clean, covered container and refrigerate promptly. Follow local food-safety recommendations for how long they can be stored.
Egg storage practices differ between countries because production, washing, and distribution systems are not identical. Follow the instructions on the packaging and local food-safety guidance.
13. Should You Use the Water Float Test?
You may have heard of a simple trick for checking whether an egg is fresh: place it in a bowl of water.
A fresh egg generally sinks and rests on its side. An older egg may stand upright, while a very old egg may float.
Why does this happen?
As an egg ages, moisture and carbon dioxide escape through the shell. The air cell inside gradually becomes larger. This changes the egg's buoyancy.
The float test can therefore provide a rough indication of age.
However, it cannot reliably determine whether an egg is safe to eat.
An egg that sinks may still contain harmful bacteria. An egg that floats may simply be old rather than necessarily contaminated.
For this reason, the float test should not replace proper storage, checking the shell, and cooking eggs thoroughly.
If an egg is past its recommended date, has been stored incorrectly, or raises other safety concerns, do not rely on a bowl of water to make the decision.
14. How to Recognize an Egg That Should Be Discarded
Although no visual test can guarantee safety, some signs are clear reasons not to use an egg.
Discard an egg if:
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The shell is cracked or leaking and its storage history is uncertain.
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The contents have an unmistakably rotten or sulfur-like odor.
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The egg white or yolk has unusual discoloration that cannot be explained by a known food or production factor.
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The egg has visible mold.
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It has been left unrefrigerated beyond recommended limits in a situation where refrigeration is required.
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It comes from a damaged, recalled, or otherwise unsafe batch.
A rotten egg often has a strong unpleasant odor when cracked. However, the absence of a bad smell does not guarantee that the egg is free from Salmonella.
Do not taste raw egg to check whether it is safe.
If you accidentally crack a spoiled egg into a bowl, discard the contents and wash the bowl and utensils thoroughly with hot, soapy water before using them again.
It is also sensible to wash your hands after handling raw eggs and before touching ready-to-eat food.
15. Why You Should Crack Eggs Into a Separate Bowl
There is a simple kitchen habit that can prevent unnecessary food waste: crack each egg into a small separate bowl before adding it to a larger mixture.
This is particularly useful when preparing cakes, pastries, sauces, or large batches of scrambled eggs.