Ontario Food Handler Certification 2025 – 400 Free Practice Questions to Pass the Exam

The correct answer is protozoa because these single-celled organisms can be responsible for various foodborne illnesses. Protozoa are known to thrive in contaminated water and food sources, and some strains can lead to severe gastrointestinal diseases in humans.

While bacilli, yeast, and mold can also contribute to food spoilage and certain health issues, protozoa are more specifically linked to serious illnesses, such as giardiasis and cryptosporidiosis, which can arise from consuming contaminated food or water. Their ability to survive in different environmental conditions and their resistance to certain treatment methods make them significant pathogens of concern in the context of food safety.