Guidance differs by country — Cook until steaming hot, 74C / 165F, before eating cold cured meat

The verdict

Guidance genuinely contradicts itself across borders on this one, and it is not a case of one country being out of date.

In the UK: cold cured meats - salami, pepperoni, chorizo, prosciutto, parma ham, bresaola, pancetta - should be cooked until steaming hot before eating. The NHS files them under foods to be careful with, not foods that are safe.

In Canada: dried and salted deli meats such as salami and pepperoni are listed as the safer alternative to other deli meats. The same product the NHS asks you to cook is the one Health Canada points you towards.

Cooked hot is safe everywhere. Chorizo fried into a dish, pepperoni on a pizza straight out of the oven, prosciutto crisped under a grill - none of these is in dispute anywhere.

Two organisms, two different stories

The reason the guidance splits is that different agencies have picked different hazards to worry about, and the curing process handles them differently.

Listeria is the framing every authority uses. The NHS states that cold cured, ready-to-eat meats may contain listeria bacteria, which can cause listeriosis, and that listeriosis can cause miscarriage or stillbirth, or make a newborn seriously unwell. Listeria grows at fridge temperatures, so a sealed pack of prosciutto in date is not self-protecting. Heat kills it reliably, which is why every listeria-based rule ends in "cook it".

Toxoplasma is the framing only the UK and New Zealand publish, and it is the one that explains the international split. The NHS lists it first: there is a small risk of getting toxoplasmosis if you eat raw, undercooked or cured meat, which can cause miscarriage. New Zealand Food Safety says toxoplasmosis can come from eating unwashed vegetables, undercooked meat, or ready-to-eat meats such as salami or ham, and that it can cause eye or brain damage in unborn babies.

Toxoplasma gondii forms tissue cysts in muscle. Cooking destroys them; so does deep freezing at commercial temperatures. Salting, drying and fermenting reduce cyst viability but do not reliably eliminate them, and the reduction depends on salt concentration, water activity and time - variables that differ between a supermarket salami and an artisan one. Toxoplasmosis in pregnancy is usually silent in the mother, which is what makes it hard to manage.

Which pathogen each regulator is addressing is the whole explanation for the contradiction below. It is not that one country is wrong.

The freezing advice has gone, and here is where it came from

Older advice suggested freezing cured meat at home for a few days before eating it cold, on the toxoplasma logic above. That advice no longer appears anywhere on nhs.uk - not on the foods-to-avoid page, not on the toxoplasmosis page, not on the listeriosis page. Do not rely on it.

Its ancestor is still findable. The CDC's toxoplasmosis prevention guidance advises freezing meat for several days at sub-zero Fahrenheit temperatures before cooking to greatly reduce the chance of infection - but that is about meat you are going to cook, not about ready-to-eat cured meat, and the CDC adds in the same breath that freezing does not reliably kill other parasites or harmful bacteria. Domestic freezers do not reliably hold sub-zero-Fahrenheit temperatures, and freezing does nothing at all to listeria, which survives it comfortably. The current NHS instruction is to cook, not to freeze.

There is also an internal NHS variance worth knowing about. The foods-to-avoid page says cook cured meat until steaming hot. The NHS toxoplasmosis page is blunter: do not eat raw or undercooked meat, or cured meats like salami or parma ham. Same organisation, two registers.

How much is too much, and what temperature

There is no portion limit. This is a preparation rule, not a dose rule.

The temperature is the number that matters:

UK: cooked until steaming hot before eating. No figure is given on the NHS page; steaming hot throughout is the test.
US: the CDC puts hot dogs, luncheon meats and deli meats on the lower-risk side once reheated to steaming hot or 165F, which is 74C.
Canada: 74C (165F) is the standard safe internal temperature used across Health Canada's guidance.
Australia: FSANZ gives freshly cooked, or thoroughly reheated until steaming hot, as the safer alternative to cold ready-to-eat meats.
New Zealand: food eaten out should be served at over 75C.

Warming is not cooking. A prosciutto and rocket pizza where the ham is laid on after the bake has not been heated. Salami that has been under a grill for thirty seconds has not reached temperature in the middle of the slice.

If you have already eaten some

A slice of chorizo or a few pieces of parma ham is a low-probability exposure and no authority treats it as an incident. There is no preventive test and no treatment given on the basis of exposure alone.

Symptoms are what matter, and the two organisms behave very differently. Listeriosis can appear as late as two months after eating contaminated food, according to ACOG, and often presents as nothing more than fever, chills and muscle aches. Toxoplasmosis in an adult is usually silent, or produces mild flu-like symptoms and swollen glands.

The practical rule for both: if you develop an unexplained fever in pregnancy, contact your midwife or doctor and tell them what you have eaten recently. Listeriosis is treated with antibiotics, and toxoplasmosis in pregnancy can also be treated - in both cases treating the mother is what protects the baby, so the information is worth volunteering rather than waiting to be asked.

Where guidance genuinely differs

This is the clearest international inversion in the batch.

The UK says cook it. The NHS lists cold cured meats such as salami, pepperoni, chorizo and prosciutto among foods to be careful with, to be cooked until steaming hot before eating.

Canada says these are the safer ones. Health Canada's Safe Food Handling for Pregnant People, published March 2025, has a deli meats row with two columns. Under "food to avoid": non-dried deli meats, such as bologna, roast beef and turkey breast. Under "safer alternatives": dried and salted deli meats, such as salami and pepperoni. No heating required - they sit alongside "non-dried deli meats that are heated until steaming hot" as an equally acceptable option.

The CDC says the exact opposite, two months earlier. Its Safer Food Choices for Pregnant Women, dated 31 January 2025, puts "unheated deli meat, cold cuts, hot dogs, and fermented or dry sausages" in the riskier column, with the same products "heated to 165F or until steaming hot" as the safer choice. Fermented or dry sausages is the salami and pepperoni category, named explicitly. Two North American federal agencies, the same product class, opposite verdicts, published eight weeks apart.

Australia does not make the distinction at all. FSANZ lists cold ready-to-eat meats from deli counters and packaged sliced meats as higher risk, with freshly cooked or thoroughly reheated meat as the alternative, and reheating to 75C.

New Zealand extends the rule to dried meat explicitly. MPI's processed meats row names ham, salami, luncheon, pâté, pastrami, biltong and jerky - dried meat included by name - and says don't eat unless heated until piping hot, over 75C. It is the mirror image of Health Canada's carve-out.

The explanation is which pathogen each regulator is regulating. Health Canada's guidance names listeria and never mentions toxoplasma, and drying and salting genuinely do suppress listeria growth - so its advice is internally consistent, just answering a narrower question. The UK and New Zealand, the two authorities that name toxoplasma, do not soften for dried products, because curing does not reliably inactivate toxoplasma cysts.

One rule satisfies all five: heat it until it steams. That is safe under every jurisdiction's reasoning, and it is the only thing that is.

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