Food Manager Practice Exam

Which parasite is commonly found in contaminated water and is a common cause of waterborne illness?

1. Salmonella

2. Giardia

3. Listeria

4. E. coli

The correct answer is: Giardia

Giardia is a protozoan parasite that is particularly associated with waterborne illnesses. It is commonly found in contaminated water sources, including lakes, rivers, and poorly treated municipal water supplies. The parasite is resistant to chlorine and can survive in a variety of environmental conditions, making it a significant concern for public health. When ingested, Giardia can lead to giardiasis, which presents symptoms such as diarrhea, abdominal pain, and nausea. The transmission occurs primarily through ingestion of contaminated water, underscoring the importance of safe water practices and sanitation measures in preventing waterborne diseases. In contrast, while Salmonella, Listeria, and E. coli can also cause foodborne illnesses, they are not specifically tied to contaminated water in the same manner as Giardia, which is why Giardia is recognized as a common cause of waterborne illness.