Its prevalence in a given operation depends mainly on its hygienic and management conditions.Being rather large, hog lice can be seen by the naked eye, as well as masses of eggs (nits) that look like a yellow crust.Hog lice are not contagious for cattle, sheep, poultry or livestock other than pigs, nor for pets or humans.Lice infestations are called pediculosis, and in the case of Haematopinus als