Make sure that you and your kitchen are clean. Always wash your hands before you touch food. Use warm water and soap. Wash everything else before and after it touches food. Wood cutting boards are very hard to clean.
Germs hide in the cracks.
Use a plastic cutting board instead. Fresh fruits and vegetables also need to be clean. Rinse them under running water to wash dirt away. Raw meat, raw poultry, and raw seafood can spread germs in your kitchen. Wash it before you use it again.