1. An infected person touches food with their bare hands that have poop or vomit particles on them.
2. Food is placed on a counter or surface that has poop or vomit particles on it.
3. Tiny drops of vomit from an infected person spray through the air and land on the food
4. The food is grown or harvested with contaminated water, such as oysters harvested from contaminated water, or fruit and vegetables irrigated with contaminated water in the field