Annalisa Hultberg, extension educator, food safety Animal-based soil amendments such as composted manure and poultry litter can build the health, tilth, fertility and water hold capacity of your soil. They can also be a great way to use resources you might have on the farm such as manure. However, all animal-based soil amendments, especially those that include untreated (raw) manure can have pathogens that can cause human illness. Here are some guidelines to help you minimize any potential risk of contamination and foodborne illness as you use these products. What are the risks with animal-based soil amendments? All animal-based amendments carry a risk of microbial contamination, though many factors affect the level of risk in each. Different animals tend to be reservoirs for different pathogens. For example, poultry like chickens and turkey often shed Salmonella and Campylobacter and ruminants (cows and sheep) often shed toxigenic E. coli...