Pasteurized Cheese During Pregnancy: When Is It Safe, and When Is Pasteurization Not Enough?

If you have ever stood in front of the cheese shelf, spotted the word pasteurized, and wondered whether that alone makes it safe to eat during pregnancy, the short answer is: usually yes, but not always. Pasteurized cheese means the milk itself was pasteurized, not that the final product is completely sterile. That is the part many pregnant women find confusing: pasteurization clearly lowers risk, but it does not prevent every contamination event that can happen later during manufacturing, slicing, packaging, or storage.

The good news is that you do not need to eliminate all cheese from your diet. What matters is knowing which types are generally reassuring choices, when an extra step like heating makes sense, and when avoiding it is the smarter decision.

Quick take

• Choose commercially packaged cheese that clearly states it is made from pasteurized milk.
• Avoid any cheese made from raw or unpasteurized milk during pregnancy.
• Fresh, soft, high moisture cheeses require more caution than aged hard cheeses, even if they are pasteurized.
• Brie, Camembert, and soft blue cheeses are not eaten uncooked during pregnancy, even when pasteurized.
• Cheese sliced at the store or taken from a deli case is not the same as a sealed package, because extra handling increases the chance of contamination.
• When cheese is soft, fresh, or sliced at the deli, heating it to 74°C / 165°F, or until steaming hot, adds an important extra margin of safety.

Why is the rule different during pregnancy?

The main concern here is listeria, a bacterium scientifically known as Listeria monocytogenes. According to the American College of Obstetricians and Gynecologists guidance on listeria in pregnancy, pregnant women are among the groups at highest risk of complications from this foodborne infection. A mother’s symptoms may be mild or nonspecific, such as fever, muscle aches, fatigue, nausea, or diarrhea, while the consequences for the pregnancy can be much more serious, because the infection can cross the placenta and increase the risk of miscarriage, stillbirth, preterm birth, or severe infection in the newborn.

ACOG also notes in its clinical guidance on presumed exposure to listeria during pregnancy that assessing exposure and symptoms in pregnancy is not a minor detail, because maternal illness may appear mild while the medical decision-making is still important for fetal protection.

A second issue is that listeria does not behave like many other bacteria that are easily controlled by cold temperatures. The CDC explains on its safer foods page for pregnant women that this bacterium can survive and grow in the refrigerator. So refrigeration matters, but it does not kill listeria or automatically make a food safe.

In our region there is a second risk that matters just as much: brucellosis, also called Malta fever. It spreads mainly through unpasteurized milk and cheese from goats and sheep (WHO), and in Saudi Arabia raw milk, mainly from sheep and camels, is a main risk factor. Infection in pregnancy has been linked to miscarriage and fetal loss (Saudi Medical Journal, 2019). Our article on milk during pregnancy covers it in more detail.

What does pasteurization actually do, and what does it not do?

Pasteurization is a heat treatment applied to milk to kill or reduce disease-causing germs before the milk is turned into cheese. That is why the American College of Obstetricians and Gynecologists clearly states that cooking and pasteurization are the methods that kill listeria in milk or food.

But this is the key line to understand: pasteurization treats the milk at the beginning of the process, not everything that happens afterward. Cheese made from pasteurized milk can still become contaminated later if equipment or surfaces are contaminated, if there is a problem in the production environment, during slicing and packaging, during transport and storage, or through handling in a store or restaurant.

This is not just a theoretical possibility. CDC documentation of a listeria outbreak linked to soft cheeses and the investigation details for that outbreak showed that some cases were linked to soft cheeses made from pasteurized milk. In other words, the word pasteurized does reduce risk, but it is not an absolute guarantee if contamination happens after pasteurization.

So the right question is not simply "Is the cheese pasteurized?" It is: is it pasteurized, well packaged, from a reliable source, properly refrigerated, and is it the kind of cheese that tolerates storage more safely, or one of the moist ready-to-eat types that are more vulnerable to any later contamination?

When is pasteurized cheese generally a safe choice?

Texture is not the whole story, but it is a useful practical clue. In general, the lower the moisture, the firmer the cheese, and the less handling it undergoes after production, the more reassuring the choice tends to be. Here is a practical way to decide:

Situation	Practical decision during pregnancy	Why
Packaged aged hard cheese labeled as made from pasteurized milk, such as cheddar, Parmesan, Asiago, Gruyère, and Emmental	Usually a safe choice	Lower moisture means listeria is less likely to grow than in fresh cheeses
Cottage cheese, cream cheese, mozzarella, and feta, if packaged and clearly labeled as made from pasteurized milk	Usually acceptable	These cheeses are not automatically off-limits in pregnancy, but clear labeling and proper refrigeration matter a lot
Fresh white cheese, such as akkawi, nabulsi, white cheese in brine, or cheese sold by weight	Needs more caution, and is best heated to 74°C or until steaming hot	High moisture and direct ready-to-eat use make any later contamination more important
Cheese sliced from a deli case or display counter	Do not eat it cold; heat it until steaming hot	Slicing and handling add another chance for contamination after production
Brie, Camembert, and soft blue cheeses, even when pasteurized	Do not eat them uncooked; cook until steaming hot	The UK NHS advises cooking these cheeses whether or not they are pasteurized
Any cheese without a clear label, with damaged packaging, or questionable refrigeration	Avoid it	You cannot judge safety by taste, smell, or appearance

This overall picture is consistent with the CDC safer foods list for pregnant women, which considers many pasteurized cheeses acceptable, especially when they are clearly packaged and come from a trusted source.

When is pasteurization alone not enough?

Fresh, soft, high moisture cheeses

This is the category that deserves your closest attention. Fresh, moist cheeses may be linked to listeria infection even when they are made from pasteurized milk, if contamination happens later during manufacturing. That is exactly what the CDC describes in its investigation of an outbreak linked to soft cheeses. The documented US outbreaks involved queso fresco-style cheeses, and the CDC advises against eating those unheated, even when pasteurized. Akkawi and nabulsi have not been linked to those outbreaks, but they are fresh, moist cheeses too, so the same care makes sense.

The practical rule here is straightforward: if the cheese is fresh, white, very moist, and eaten as is, it is not enough to hear a seller say it is pasteurized. It is better for it to come in a sealed commercial package, with a clear label and a reliable origin, and even then, heating it is the more cautious option if it is one of the higher moisture types. That is easy in our kitchen: heat akkawi or nabulsi in the oven or pan until melted and steaming, as in kunafa, manakeesh, or a toasted sandwich.

Cheese sliced in the store or at the deli

Even if the original cheese was pasteurized, slicing adds another layer of handling and contact with surfaces and tools. That is why the CDC advises pregnant women to choose a safer alternative by heating to 74°C / 165°F or until steaming hot when it comes to higher risk ready-to-eat foods. The same logic applies even more to cheese sliced from a display case than to factory sealed packages.

Brie, Camembert, and blue cheeses

A common mistake is to reduce the whole issue to the words soft cheese. More accurately, texture alone is not the final scientific standard, but these cheeses are often moist and ready to eat, and they may sometimes be sold unwrapped or from an unclear source. The American College of Obstetricians and Gynecologists includes unpasteurized versions of feta, queso fresco, Brie, Camembert, and blue cheeses among the foods that should be avoided during pregnancy.

Even when the product is truly pasteurized, we use the more cautious rule: soft white-rind cheeses such as Brie and Camembert, and soft blue cheeses, are not eaten uncooked during pregnancy. They become safe once cooked until steaming hot, as in hot pies and pastries. That is the advice of the UK NHS. The US CDC words its advice differently and does not name Brie, which is why you may read different advice elsewhere.

When the source is unclear

In our markets, you may find imported cheese, locally made cheese, cheese sold by weight from a display case, or hand wrapped pieces without a complete label. In that setting, the traditional cheese name is not enough, nor is the country of origin, nor the way the cheese looks. Feta may be pasteurized or unpasteurized. Mozzarella may be safe or not, depending on the milk, the manufacturing process, and how it was handled. Salty white cheese is not a single microbiological category.

If you cannot find the words made from pasteurized milk, if the seller sounds unsure, or if storage conditions are unclear, treat the product as unsuitable during pregnancy. That is a practical decision, not an overreaction.

A practical checklist for buying and serving cheese

Follow these steps each time, and your choices will become much easier:

1. First, look for the words made from pasteurized milk, and do not assume pasteurization based on the cheese name alone.
2. Prefer sealed commercial packages over cheese cut in front of you or sold without a clear label.
3. Leave any package that is swollen, leaking, damaged, or seems to have been kept under unstable refrigeration.
4. Choose hard or lower moisture cheeses when you want a more reassuring everyday option.
5. If you buy soft or fresh cheese, keep it well refrigerated, follow the use-by date on the package, and do not rely on the refrigerator to kill germs.
6. Wash your hands, use a clean knife and board, and keep ready-to-eat cheese away from raw meat and raw seafood to avoid cross-contamination.
7. Heat higher risk cheese, such as fresh moist cheese or deli-sliced cheese, to 74°C / 165°F or until steaming hot if the serving method allows.
8. If you are unsure, simply choose something else. During pregnancy, clarity is better than risk.

Common misconceptions that need correcting

Pasteurized means completely risk-free.
No. Pasteurization reduces risk significantly, but it does not prevent contamination that may happen afterward.

All soft cheese is forbidden.
Not that simple. Some pasteurized soft cheeses may be acceptable, such as mozzarella, cream cheese, or pasteurized feta, but the real decision depends on the product type, its label, its source, and how it was stored.

The refrigerator stops listeria.
Incorrect. Listeria can survive and grow in cold temperatures, which is why refrigeration reduces risk, but does not reliably kill the bacterium.

The cheese name or country of origin is enough to judge safety.
No. Neither the name feta, nor Brie, nor imported, nor the name of a local producer proves safety by itself. What matters is pasteurization, production control, packaging, and refrigeration.

If the cheese is pasteurized, there is no need to heat it.
That is oversimplified. With fresh, soft, and store-sliced cheeses, heating may be a smart extra step because it addresses the possibility of contamination that happened after pasteurization.

What if you ate cheese that seemed questionable?

There is no need to panic over a single exposure, but do not ignore it either. If you learn that the cheese was unpasteurized, if it has been recalled, or if you develop symptoms such as fever, muscle aches, fatigue, nausea, vomiting, or diarrhea, contact your doctor or local health authority. You can also review ACOG’s guidance on managing presumed exposure to listeria during pregnancy to understand why medical evaluation matters based on the type of exposure and whether symptoms are present.

Keep the timing in mind too. Symptoms can take weeks to appear, and in pregnancy they took around 4 weeks on average in one review, ranging from about 2.5 to 10 weeks (BMC Infectious Diseases, 2013). So do not feel reassured after one symptom-free week, and tell your doctor about any fever or flu-like symptoms over the following two months.

Bottom line

Cheese made from pasteurized milk is often a safe option during pregnancy, but pasteurization alone does not eliminate the risk of later contamination. So do not look only at the cheese name. Look at the label, the packaging, the source, the refrigeration, and the nature of the cheese itself. The more moist the cheese is, and the more handling it has gone through, the more caution matters, and heating to 74°C or until steaming hot becomes a useful extra step when possible.

Put more simply, there is no need to ban all cheese, and no reason to place blind trust in the word pasteurized alone. Choose carefully, read the label, avoid unpasteurized products, and be more cautious with fresh, soft, and store-sliced cheeses. That is exactly the kind of calm, practical decision-making I always aim to support when writing about pregnancy nutrition.

Sources

• American College of Obstetricians and Gynecologists: Listeria and Pregnancy
• American College of Obstetricians and Gynecologists: Management of Pregnant Women With Presumptive Exposure to Listeria monocytogenes
• Centers for Disease Control and Prevention: Safer Foods for Pregnant Women
• Centers for Disease Control and Prevention: Listeria Outbreak Linked to Soft Cheeses
• Centers for Disease Control and Prevention: Investigation Details of the Listeria Outbreak Linked to Soft Cheeses
• Centers for Disease Control and Prevention: Preventing Listeria Infection
• UK National Health Service: Foods to avoid in pregnancy
• BMC Infectious Diseases (2013): What is the incubation period for listeriosis?
• World Health Organization: Brucellosis
• Saudi Medical Journal (2019): Brucellosis in Saudi Arabia

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