raw garlic is to provide garlic's anti-inflammatory action and (since it is raw) to provide an antibiotic action. Raw garlic is antibacterial and anti-fungal. This action is lost when garlic is cooked or dried. Dry ginger is also a good anti-inflammatory.normally its half a clove per day for an average dog. I give the same for gaint breed also as some dogs might not be suitable to absorb it and can cause problem of blood composition disbalance.
Fresh ginger or pickled ginger are good anti-emetic compounds, calming the stomach.They are effective in the relief of nausea.
Ginger is a broad sense of dewormer.Garlic cloves contain strong detoxifying agents, which also serve to repel worms and other pests.
For parasites on raw food, i rinse it with salt which helps cleaning the hidden dirt also and then wash it thoroughly with water to remove the salt.