Current worldwide prevalence has been estimated at 2% of the human population, but accurate numbers are difficult to gauge because crab lice infestations are not considered a reportable condition by many governments, and many cases are self-treated or treated discreetly by primary physicians.
A actual prevalencia no mundo estímase no 2% da poboación humana, pero a cifra exacta é difícil de determinar porque as infestacións por este piollo non son consideradas na maior parte dos países unha condición da que se debe informar aos gobernos, e moitos casos son auto-tratados ou tratados discretamente polos médicos de medicina xeral.