well yes, teatime- foxes can carry worms, toxicaria- and it is a worry. With wild garlic, you wash it really well before you use it- can cook it too. SAme with nettles, sorrel, and all sorts of wild herbs. Same with mushrooms. Raspberries grow high enough not to be affected by foxes, so I eat straight from the bush.
But, I will have to admit, that I can't resist wild strawberries- THAT taste is worth the risk. Probably a lot safer than all the chemical sprayed stuff we get sold- but I take your point,.
Wild hazelnuts are totally safe, so are sloes, elderberries, etc, etc. as they grow too high.
Morel mushrooms must never be eaten raw- so I dry them, then re-hydrate and cook them well.