FOOD "HYGIENE" IN THE GARDEN
There have been a lot of cases of food poisoning from fresh produce over the past few years. I've been glad that I grow my own vegetables in summer. In winter, I mostly use canned or frozen produce. I have always been concerned in winter about the greens I feed my guinea pigs; so far, none of us have been sick.
One can learn good gardening practices designed to avoid sickening yourself and anyone with whom you share your vegetables. This site has an article about what to do and not to do: garden food safety