Short Answer 
To prevent infection from the parasite Giardia duodenalis, ensure safe water supplies by using treated water and avoiding natural sources. Steer clear of home canned foods unless they meet safety standards and exercise caution with wild mushrooms, opting for store-bought varieties instead.
Step 1: Ensure Safe Water Supplies
To prevent infection from the parasite Giardia duodenalis, it is crucial to use safe water supplies. This means sourcing water that has been treated and is free from contaminants. Always check local guidelines and avoid drinking from natural water sources unless they are properly filtered or treated.
Step 2: Avoid Home Canned Foods
Improper handling and canning practices can lead to food contamination. Thus, it is essential to avoid consuming home canned foods unless they have been processed with appropriate safety measures. Always opt for commercially canned or preserved foods, as they adhere to strict safety standards.
Step 3: Stay Cautious with Wild Mushrooms
Many wild mushrooms can harbor harmful parasites and toxins that may lead to infections like Giardia. It is best to avoid cooking with wild mushrooms unless you have expert knowledge about their safety. Stick to grocery store varieties that are recognized as safe for consumption.