Bdellovibrio species are naturally predatory, small, motile, Deltaproteobacteria that invade the periplasm of other larger gram-negative bacteria, killing and digesting them.
This is because lectins are tied directly to inflammation and autoimmune reactions in your body. Lectins are a form of protein found in nearly all plants and animals. They bind to the sugar molecules called polysaccharides that cover the surface of most cells in your body.
Lectins are a defense mechanism which all life forms appear to have. Essentially, they are a low level toxin. The purpose of lectins is to discourage other animals from eating that life form. By triggering a negative reaction in the predator, that life form is then viewed as an undesirable food source.