Eggs have small pores which harmful bacteria can enter. Even shells that appear clean can carry germs. Even so, eggs do not need to be washed. If not washed, they can keep without spoiling for weeks without refrigeration.
Egg washing is not required in Australia, but sale of dirty eggs is prohibited by Food Standards Australia New Zealand (FSANZ). Storing washed eggs below 7°C can help reduce the ability of Salmonella to grow.
The best method for how to wash fresh eggs is by using warm water that is at least 90 degrees Fahrenheit. Washing with warm water causes the egg's contents to expand and push dirt and contaminants away from the shell's pores. Never soak eggs, even in warm water.
Is washing of eggs recommended? No, because washing may aid the transfer of harmful bacteria like Salmonella from the outside to the inside of the egg. The priority in egg production is to produce clean eggs at the point of collection, rather than trying to clean them afterwards.
Unwashed eggs have a protective layer called a cuticle (also referred to as the bloom) and can be stored on the counter. This protective coating works by sealing the shell's pores and preventing air from penetrating it, helping to keep bacteria out.
“Because the shell is so porous, you're pushing it back through the surface of the egg,” she says. And that poses a far bigger risk of contaminating the part of the egg that you're actually going to eat.
Eggs that are not thoroughly cleaned can cause human illness. Salmonella, a disease associated with poultry, can also be passed through contaminated shells. Dirty shells contaminate clean cooking areas, kitchen utensils, food, or hands. Eggs have small pores which harmful bacteria can enter.
Commercial eggs are required to be pre-washed, and honestly, considering the living circumstances of many of the birds, it's better that way. However, farm fresh eggs are a different story. You don't actually NEED to wash your eggs, although there are some circumstances where you may want to.
Should You Wash Fresh Eggs? You do not need to wash fresh eggs. Fresh laid eggs from backyard chickens or farm-fresh eggs from a local farm or farmers' market contain a protective protein film around the eggshell known as the egg bloom or cuticle.
In some European countries, egg-laying hens are vaccinated against salmonella. In the U.S., vaccination is not required, but eggs must be washed and refrigerated from farm to store, and producers must follow a host of other safety measures.
WASHING EGGS • Wash and rinse eggs in warm to hot water. Water temperature in the 90-120oF range is best; hot tap water is generally 120oF. The temperature should be at least 20 degrees warmer than the egg. If “freshly laid” eggs are gathered, use temperatures at the warmer end of the range.
Mercree does admit that farm-fresh eggs – which have not undergone the rigorous commercial washing process – do have a greater potential to come into contact with dirt. Though she still recommends against washing them, she says that if you do wash them, make sure you're using warm water and avoiding soap.
It's not necessary to use any soaps or detergents. Unwashed eggs will last at least two weeks unrefrigerated, and three months if refrigerated. Washed eggs should be refrigerated, and will last at least two months, but won't taste as fresh as an unwashed egg of the same age.
In the U.S., the Department of Agriculture (USDA) requires that eggs destined to be sold on supermarket shelves — called graded eggs — are washed and sprayed with a chemical sanitizer before they are sold to the public to reduce the risk of salmonella infection.
In the US, to reduce the risk of salmonella infection, eggs are washed and sprayed with a chemical sanitiser before they are sold to the public. Clean eggs are kept at cooler temperatures to prevent the eggs from deteriorating as quickly and to keep the growth of bacteria in check.
Food Standards Australia New Zealand's Response
The statement continues to say that refrigerating whole eggs is not required because: The Salmonella bacteria which can contaminate an egg while it's inside the bird isn't present in Australian eggs.
How to store fresh eggs. Once they're out of the coop and free of any of the feathers and poop that came with them, eggs should be refrigerated. Although unwashed eggs with cuticles intact can safely be stored at room temperature, refrigerating your eggs will help them last longer; about 5-6 weeks.
Most other countries do not wash their eggs. They put a higher priority on the cuticle, since it naturally keeps the egg safe from salmonella. By not removing the cuticle, it also eliminates the need to refrigerate the eggs after they have been laid.
Americans, along with the Japanese, Australians and Scandinavians, all wash their eggs and therefore have to refrigerate them. After the chickens lay the eggs, they're immediately placed into a machine that washes them with soap and hot water.
At the grading station, eggs are washed in a sanitizing solution and scrubbed with revolving brushes to remove dirt and any bacteria that may be found on the shell. There is no need to wash your eggs at home. Learn more.
While washing eggs is a key step in preventing salmonella from occurring on the outside of the egg, the bacteria can still be found within the egg.
The washing process removes contaminants, but it also removes the natural coating of the egg, leaving the shell porous. On U.S. commercial egg farms, it is required that eggs are thoroughly washed and immediately refrigerated before they leave the farm and during transportation to the grocery store.
Store bought eggs have been cleaned and the bloom has been removed, so they always need refrigeration after you buy them. What is this? It's still good practice to rinse them just before using them.
The frequency of Salmonella-contaminated eggs in Australia is very low. Despite this, there is a potential risk of illness from consumption of raw or lightly-cooked eggs, or the consumption of uncooked foods containing raw egg.
The eggs stored in cold temperature tend to undergo condensation when they are taken out to room temperature. This promotes the growth of bacteria over the egg shell, thereby contaminating the egg and making it harmful for human consumption.