Final answer:
Giardiasis is linked to consumption of raw or undercooked food, contaminated water, and unwashed fruits and vegetables. It is caused by the Giardia lamblia parasite, which can contaminate food and water sources.
Step-by-step explanation:
The food commonly linked with the parasite Giardiasis is all of the above: raw or undercooked food, contaminated water, and unwashed fruits and vegetables. Giardiasis is a type of gastroenteritis caused by the Giardia lamblia protozoan, which is a flagellate protozoan that enters the body through consumption of food or water contaminated with the feces of infected individuals or animals. The Giardia protozoa attach to the small intestine's lining, leading to symptoms such as diarrhea, abdominal pain, and fever.
Transmission of G. lamblia can occur via eating contaminated food like raw vegetables or leafy greens, as well as consuming water that hasn't been properly treated to remove the parasite's cyst stage. Additional means of transmission include close contact with an infected person and consumption of raw or undercooked meat or seafood.