Infestation is common, found worldwide, and affects people of all races. Body lice infestations spread rapidly under crowded conditions where hygiene is poor and there is frequent contact among people. Lice ( Phthiraptera ) Body Lice ( Pediculus humanus humanus ) Morphologically almost indistinguishable from head lice Slightly larger, larger claws, correlates with coarser hair Major differences behavioral : 1. Are on host only to blood feed, then retreat to clothing 2. Attach eggs to clothing 3. More resistant to lower temperature and humidity Lice ( Phthiraptera ) Eggs They are generally easy to see in the seams of clothing, particularly around the waistline and under armpits. Nits may also be attached to body hair. They are oval and usually yellow to white. Nits may take 30 days to hatch. Lice ( Phthiraptera ) Nymphs Nymphs looks like an adult body louse, but is smaller. Nymphs mature into adults about 7 days after hatching. To live, the nymph must feed on blood. Lice ( Phthiraptera ) Adults The adult body louse is about the size of a sesame seed and is tan to greyish-white. To live, adult lice need to feed on blood. If the louse falls off of a person, it dies within 10 days.
8 Lice ( Phthiraptera ) Symptoms The first symptom associated with body is itching. Scratching can lead to further skin irritation due to infection, especially if lice feces are present. Body lice are very small, so close, careful inspection is necessary in order to determine their presence. Transmission Body lice are spread directly through contact with a person who has body lice, or indirectly through shared clothing, beds, bed linens, or towels. Lice ( Phthiraptera ) Treatment and prevention Body lice are relatively easy to control by implementing a few simple steps. Regular changing and laundering of clothes (especially underwear), or disposal of affected clothing, will control lice. Using a hot water wash on clothes, followed by ironing will ensure all lice and nits have been killed. An increased level of personal hygiene with regular bathing or showering is essential for control. Dry cleaning or tumble drying affected items at >60 o C for 15 minutes is another method of effectively killing lice and eggs. Lice ( Phthiraptera ) Genome sequence of the body louse In 2005 the body louse genome was one of seven non-mammalian organisms chosen this year for the program and one of three targeted for a high-quality sequence. In Feb 2007, the first draft of the human body louse genome (Pediculus humanus humanus) was released on VectorBase. The genome is exceptional in that it is the smallest insect genome known. Lice ( Phthiraptera ) Pubic Lice ( Phthirus pubis ) Also called "crabs," pubic lice are parasitic insects found in the genital area of humans. Infection is common and found worldwide.
- Spring '09
- Head louse, Pediculosis, Body louse, Crab louse, Louse, Relapsing fever