It is possible for crab slaves to infect humans. Crab slugs are parasitic worms that live in crabs, and crabs with slugs in them should not be eaten.

Crab slaves (Sacculina sp.) are arthropods (Arthropoda), crustaceans subphylum (Subphylurm Crustaceea), trapezoids (Cirripedia) animals, the body is soft and elliptical sac-like, brown, neither the mouthparts, nor appendages, only the well-developed gonads and outer coat membrane. and the outer coat membrane.

Crab slaves parasitic in the abdomen of the crab, the body is divided into crab slaves external body (Sacculina externa) and crab slaves internal body (Sacculinainterna) two parts, the former protrudes outside the host, including the stalk and incubation capsule, that is, the commonly seen umbilical particles; the latter for the branching tubules, extending into the host, spreading to the crab torso and the appendages of muscles, nervous system and viscera and other tissues, the latter for the branching tubes, reaching into the body, spread to the crab trunk and appendages, muscles, nervous system and viscera and other tissues. Nervous system and viscera and other tissues, the formation of a diameter of 1 mm or so of the white thread-like branches, used to absorb the crab body nutrients. It is also the culprit of "crab slave disease" in the aquaculture industry.