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You can’t see, smell, or taste foodborne pathogens. Pathogens are microorganisms sometimes found in your food that can make you sick. Many food poisonings can be prevented by following these safe food-handling practices: clean, separate, cook, and chill.

Practise food safety at all times.

What causes food poisoning?

Food poisoning is usually caused by eating foods that contain large amounts of harmful bacteria (pathogens) or from consuming foods in which bacteria have produced toxins or poisons.

What are foodborne pathogens?

Pathogens are microorganisms sometimes found in your food that can make you sick. 

They include:

  • bacteria such as Campylobacter jejuniClostridium botulinumE. coli 0157:H7, Listeria monocytogenes, salmonella, shigella, and cholera
  • viruses such as hepatitis A and norovirus
  • parasites such as Cyclospora and Trichinella spiralis

Can foodborne pathogens make you sick?

Food or drink that contains pathogens can cause food poisoning. Some people can have food poisoning with mild symptoms and not even know they have it. Most people fully recover, but some may have more severe and possibly long-term or permanent consequences and will need to visit a doctor. In some cases, foodborne illness can cause death.

Symptoms

Symptoms of foodborne illness can begin hours or days after consuming contaminated food or drink. 

The time period between consuming the pathogen and onset of symptoms depends on the type, and amount of pathogen you’ve consumed, as well as your general health. 

Many people experience:

  • nausea
  • vomiting
  • diarrhea
  • stomach pains or cramps
  • fever

What should you do if you think you have food poisoning?

See a doctor as soon as possible if you think you have a foodborne illness and are experiencing the following symptoms:

  • fever above 38.5°C (101.3°F)
  • blood in stool
  • vomiting so much you can’t keep liquids down
  • dehydration
  • diarrhea that lasts more than 3 days

Which foods are most often associated with food poisoning?

Potentially hazardous foods are most often implicated with food poisoning. Hazardous foods are foods that require time-temperature control to keep them safe for eating. If these foods are not handled safely, harmful microorganisms can easily grow to harmful levels. They include:

  • milk and milk products
  • eggs
  • cooked rice
  • meat and poultry
  • fish and shellfish
  • raw sprouts

How do you prevent food poisoning?

Follow these safe food-handling practices to reduce the chances of you and your family getting sick from food poisoning:

If you think you are experiencing symptoms of food poisoning and would like to speak with a registered nurse, Health811 can be reached by calling 811 (TTY: 1.866.797.0007).


This page was last updated August 26, 2026

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