• Tiny organisms that live inside another organism is known as parasites

• Tiny organisms that live inside another organism is known as parasites. In developed countries like the United States, this type of infections are relatively rare.
• Parasites namedCryptosporidium parvum and Giardia intestinalis spread through water contaminated with the stools of people or animals who are infected. Foods that come into contact with this impure water during growth or preparation can become contaminated with these parasites. Food preparers who are infected with these parasites can also contaminate foods if they do not thoroughly wash their hands before handling food and after using the bathroom.
• A type of roundworm parasite isTrichinella spiralis. Consuming raw or undercooked pork or wild game people often gets infected with this.

Chemicals
chemicals that are harmfull may also cause illness by contaminating foods such as –
• Shellfish or fish feeding on algae that produce toxins, leading to high concentrations of toxins in their bodies. Some types of fish, including mahi mahi and tuna, may be contaminated with bacteria which produce toxins,if they are not properly refrigerated before cooking.
• certain types of wild mushrooms.
• unwashed fruits and vegetables that contain high concentrations of pesticides.

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Foods Associated with Foodborne Illness:
• Raw foods of animal origin that is raw meat and poultry, raw eggs, unpasteurized milk, and raw shellfish are the most likely to be contaminated.
• Fruits and vegetables can also be contaminated with animal waste when manure is used to fertilize produce in the field, or unclean water is used for washing the produce.
• Raw sprouts are particularly concerning because the conditions under which they are sprouted are ideal for growing microbes.