Eat less harmful parts of animals?

The lymphoid tissue around the neck of an animal is more concentrated. We all know that there may be bacteria in the lymphoid tissue, but it does not mean that the neck equals the lymph.
For example, the pig's neck, known as "blood neck flesh" of the name, it does have more lymph nodes, especially the lesions of the lymph nodes are larger, but as long as standardized slaughter, the diseased lymph will be removed.
For chickens and ducks neck, it is best to remove skin when eating, because lymph and other detoxification glands are concentrated in the neck of the subcutaneous fat.