Glossary

Term · Pregnancy: Eating

pasteurization

Also: pasteurized, pasteurised

A heat treatment that kills most harmful germs in milk and juice. Pasteurized foods can still carry some bacteria after processing, such as Listeria in soft cheese.

In plain words

Pasteurization is a heat treatment that kills most germs in milk and juice. It is done at set temperatures for set times. Pasteurized milk is much safer than raw milk. Some germs can still reach foods after pasteurization, through handling or in the plant. is one such germ, and it can grow in soft cheeses, cold deli meats, and some other foods. in pregnancy can harm the baby, so clinicians talk about food safety with mothers. Looking for the word pasteurized on a label is one step. It is not the only check. Mothers often ask about cheese and milk products.

The deeper version

Pasteurization is a thermal process, such as 72 degrees Celsius for 15 seconds for high-temperature short-time treatment, designed to inactivate vegetative pathogens including Listeria monocytogenes, Salmonella, and Escherichia coli O157:H7. Post-pasteurization contamination, from equipment, handling, and the processing environment, remains a recognized source of Listeria in soft cheese, which can persist and grow at refrigerator temperatures. Risk assessments therefore weigh contamination after pasteurization, not only the heat step. Pregnancy carries about a tenfold higher relative risk of invasive listeriosis than the general adult population, per U.S. surveillance estimates. The FDA and CDC describe these risks in their foodborne pathogen guidance.

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Sources

  • U.S. Food and Drug Administration and U.S. Department of Agriculture — Bad Bug Book: Foodborne Pathogenic Microorganisms and Natural Toxins Handbook, second edition
  • Centers for Disease Control and Prevention — Listeria and pregnancy: guidance on food safety

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