The human body louse, Pediculus humanus humanus, is an important parasite that has been associated with humans for many years. Although, this sucking lice has no longer much importance in the developed world, it continue to have public health implications in developing countries like in Africa, Asia and central America. Poor living conditions and overcrowding facilitate the development and spread of lice among human beings. In the past, wars and famine have contribute to the development establishment of lice among humans.
Adult of human body louse measure between 2.3 and 3.6 cm in length.
Body lice have tremendous breeding capability when condition are favorable.The female can lay between four and five eggs per day which typically hatch after 8 days. The nymphs undergo three different instars before reaching the adult stage. Each nymph development takes approximately 3 to 5 days before reaching the adult stage.