Cocoon

It seems as though these nematomorphs form a cocoon, and then start a transformation. It appears to be initially composed of myelin (nerve tissue). They travel freely through the body absorbing spinal fluid and blood. The variety and number of cocoons expelled from the body was shocking. Nematomorphs are sheltered by our body's fluids and cells. No wonder doctors don't find evidence of them present when doing an autopsy. Their shapes and their molecular structure mimic our body tissues. Because the invaders masquerade as our own bodily substances, our immune system gets confused. It starts to attack our own body; the autoimmune response. Our immune system is a wonderful thing, working hard to keep us alive and well. Though unsure of what to attack, it flounders and allows the organisms to survive and reproduce. It is almost impossible to count the number of organisms in a Lyme Sufferer's body.