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((Short description|Subspecies of insect))
((About|the animal|the infestation caused by body lice|Pediculosis corporis))
((more citations needed|date=December 2023))
((Subspeciesbox
| name = Body louse
| image = Body lice.jpg
| genus = Pediculus
| species = humanus
| subspecies = humanus
| authority = [[Carl Linnaeus|Linnaeus]], [[10th edition of Systema Naturae|1758]]
))

The '''body louse''' ('''''Pediculus humanus humanus''''', also known as '''''Pediculus humanus corporis''''') is a [[Hematophagy|hematophagic]] [[Parasitism|ectoparasite]] [[louse]] that infests humans.<ref name="NYT-20231109">((cite news |last=Zimmer |first=Carl |authorlink=Carl Zimmer |title=Lice Genes Offer Clues to Ancient Human History - The jumpy parasites have followed our ancestors around for at least 25 million years, adapting along with us through major upheavals. |url=https://www.nytimes.com/2023/11/08/science/lice-genes-human-history.html |date=8 November 2023 |work=[[The New York Times]] |url-status=live | archiveurl=https://archive.today/20231109013253/https://www.nytimes.com/2023/11/08/science/lice-genes-human-history.html |archivedate=9 November 2023 |accessdate=9 November 2023 ))</ref> It is one of three  lice which infest humans, the other two being the [[head louse]], and the [[crab louse|crab louse or pubic louse]].

Body lice may lay eggs on the host hairs and clothing,<ref>((cite journal |last1=Sulica |first1=VI |last2=Graham |first2=JH |title=Generalized pediculosis corporis. Microscopic study of hairs. |journal=Journal of cutaneous pathology |date=August 1981 |volume=8 |issue=4 |pages=308–11 |doi=10.1111/j.1600-0560.1981.tb01015.x |pmid=7309944))</ref> but clothing is where the majority of eggs are usually secured.<ref>((Cite journal |last=Nuttall |first=George H. F. |date=November 1917 |title=The Biology of Pediculus humanus |url=https://www.cambridge.org/core/product/identifier/S0031182000003747/type/journal_article |journal=Parasitology |language=en |volume=10 |issue=1 |pages=80–185 |doi=10.1017/S0031182000003747 |issn=0031-1820))</ref>

Since body lice cannot jump or fly, they spread by direct contact with another person or more rarely by contact with clothing or bed sheets that are infested.

Body lice are disease [[Vector (epidemiology)|vectors]] and can transmit pathogens that cause human diseases such as [[epidemic typhus]], [[trench fever]], and [[relapsing fever]]. In developed countries, infestations are only a problem in areas of poverty where there is poor body hygiene, crowded living conditions, and a lack of access to clean clothing.<ref name=":02">((Citation|last1=Powers|first1=Jim|title=Pediculosis Corporis|date=2020|url=http://www.ncbi.nlm.nih.gov/books/NBK482148/|work=StatPearls|publisher=StatPearls Publishing|pmid=29489282|access-date=2020-02-08|last2=Badri|first2=Talel))</ref> Outbreaks can also occur in situations where large groups of people are forced to live in unsanitary conditions. These types of outbreaks are seen globally in prisons, homeless populations, refugees of war, or when natural disasters occur and proper sanitation is not available.

==Life cycle and morphology==
''Pediculus humanus humanus'' (the body louse) is indistinguishable in appearance from ''Pediculus humanus capitis'' (the [[head louse]]), and the two subspecies will interbreed under laboratory conditions. In their natural state, however, they occupy different habitats and do not usually meet. They can feed up to five times a day and as adults can live for about thirty days, but if they are separated from their host they will die within a week. If the conditions are favorable, the body louse can reproduce rapidly. After the final molt, female and male lice will mate immediately. A female louse can lay up to 200–300 eggs during her lifetime.

The life cycle of the body louse consists of three stages: egg, nymph, and adult.

# '''Eggs''' (also called nits, see [[Head louse#Eggs/nits|head louse nits]]) are attached to the clothes or hairs by the female louse, using a secretion of the accessory glands that holds the egg in place until it hatches, while the nits (empty egg shells) may remain for months on the clothing. They are oval and usually yellow to white in color and at optimal temperature and humidity, the new lice will hatch from the egg within 6 to 9 days after being laid.<ref name=":1">((Cite journal|last1=Raoult|first1=Didier|last2=Roux|first2=Veronique|date=1999|title=The Body Louse as a Vector of Reemerging Human Diseases|journal=Clinical Infectious Diseases|language=en|volume=29|issue=4|pages=888–911|doi=10.1086/520454|pmid=10589908|issn=1058-4838|doi-access=free))</ref>
# A '''nymph''' is an immature louse that hatches from the egg. Immediately after hatching it starts feeding on the host's blood and then returns to the clothing until the next blood-meal. The nymph will molt three times before the [[Imago|adult]] louse emerges. The nymph usually takes 9–12 days to develop into an adult louse.<ref name=":1" />
# The '''adult''' body louse is about 2.5–3.5&nbsp;mm long, and like a nymph it has six legs. It is wingless and is tan to grayish-white in color.

[[File:Pediculus_humanus_development_numberedblackwhite.png|thumb|Life cycle of ''Pediculus humanus capitis,'' which is similar to the body louse. The location of the body louse eggs differs from that of head louse eggs. The head louse will lay eggs on hair roots, whereas a body louse will lay eggs in articles of clothing. This picture represents the louse from egg to adult and the process of going through three molts to achieve adulthood.]]
The two  ''P. humanus'' [[subspecies]] are morphologically quite identical. Their heads are short with two antennae that are split into five segments each, compacted thorax, seven segmented abdomen with lateral paratergal plates.<ref name=":1" />

==Origins==
The body louse diverged from the head louse around 170,000 years ago, establishing the latest date for the adoption of clothing by humans.<ref>((cite journal |author1=Ralf Kittler |author2=Manfred Kayser |author3=Mark Stoneking |journal=[[Current Biology]] |volume=13 |pages=1414–1417 |year=2003 |title=Molecular evolution of ''Pediculus humanus'' and the origin of clothing |url=http://www.eva.mpg.de/genetics/pdf/Kittler.CurBiol.2003.pdf |doi=10.1016/S0960-9822(03)00507-4 |pmid=12932325 |issue=16 |s2cid=15277254 |access-date=2008-09-01 |archive-url=https://web.archive.org/web/20070710041107/https://www.eva.mpg.de/genetics/pdf/Kittler.CurBiol.2003.pdf |archive-date=2007-07-10 |url-status=bot: unknown |doi-access=free ))</ref><ref name="Stoneking">((cite web|url= http://www.current-biology.com/content/article/fulltext?uid=PIIS0960982204009856|last= Stoneking|first= Mark|title= Erratum: Molecular evolution of ''Pediculus humanus'' and the origin of clothing|access-date= March 24, 2008))((Dead link|date=October 2023 |bot=InternetArchiveBot |fix-attempted=yes ))[https://web.archive.org/web/20101020212417/http://www.cell.com/current-biology/fulltext/S0960-9822(04)00985-6 Archive]</ref><ref>((cite web|URL=https://www.sciencedaily.com/releases/2011/01/110106164616.htm|date=January 7, 2011|title=Lice DNA study shows humans first wore clothes 170,000 years ago))</ref><ref>((cite journal|last1=Toups|first1=MA|last2=Kitchen|first2=A|last3=Light|first3=JE|last4=Reed|first4=DL|title=Origin of Clothing Lice Indicates Early Clothing Use by Anatomically Modern Humans in Africa|journal=Molecular Biology and Evolution|date=2010|volume=28|issue=1|pages=29–32|doi=10.1093/molbev/msq234|pmid=20823373|pmc=3002236))</ref> Body lice were first described by [[Carl Linnaeus]] in the 10th edition of ''[[Systema Naturae]]''. The human body louse had its [[genome]] sequenced in 2010, and at that time it had the smallest known insect genome.<ref name="Kirkness">((cite journal|display-authors=2|vauthors=Kirkness EF, Haas BJ, Sun W, Braig HR, Perotti MA, Clark JM, Lee SH, Robertson HM, Kennedy RC, Elhaik E, Gerlach D, Kriventseva EV, Elsik CG, Graur D, Hill CA, Veenstra JA, Walenz B, ((Tubio JMC)),((Ribeiro JMC)), Rozas J, Johnston JS, Reese JT, Popadic A, Tojo M, Raoult D, Reed DL, Tomoyasu Y, Kraus E, Mittapalli O, Margam VM,((Li H.-M)), Meyer JM, Johnson RM, Romero-Severson J, VanZee JP, Alvarez-Ponce D, Vieira FG, Aguade M, Guirao-Rico S, Anzola JM, Yoon KS, Strycharz JP, Unger MF, Christley S, Lobo NF, Seufferheld MJ, Wang N, Dasch GA, Struchiner CJ, Madey G, Hannick LI, Bidwell S, Joardar V, Caler E, Shao R, Barker SC, Cameron S, Bruggner RV, Regier A, Johnson J, Viswanathan L, Utterback TR, Sutton GG, Lawson D, Waterhouse RM, Venter JC, Strausberg RL, Berenbaum MR, Collins FH, Zdobnov EM, Pittendrigh BR|year=2010|title=Genome sequences of the human body louse and its primary endosymbiont provide insights into the permanent parasitic lifestyle|journal=Proceedings of the National Academy of Sciences|volume=107|issue=27|pages=12168–12173|doi=10.1073/pnas.1003379107|issn=0027-8424|pmc=2901460|pmid=20566863|bibcode=2010PNAS..10712168K|doi-access=free))</ref> 
The body louse belongs to the phylum [[Arthropod]]a, class [[Insect]]a, order [[Louse|Phthiraptera]] and family [[Pediculidae]]. There are roughly 5,000 species of lice described, with 4,000 parasitizing birds and an additional 800 special parasites of mammals worldwide.<ref>((cite web |url=https://phthiraptera.myspecies.info/ |title=Phthiraptera.info |last1=Smith |first1=V.S |last2=Broom |first2=Y. |last3=Dalgleish |first3=R|publisher=International Society of Phthirapterists |accessdate=23 November 2021))</ref>

== Signs and symptoms ==
Since an infestation can include thousands of lice, with each of them biting five times a day,((citation needed|date=December 2023)) the bites can cause strong itching, especially at the beginning of the infestation, that can result in skin excoriations and secondary infections. If an individual is exposed to a long-term infestation, they may experience apathy, lethargy and fatigue.

== Treatment ==
((unreferenced section|date=December 2023))
In principle, body louse infestations can be controlled by periodically changing clothes and bedding. Thereafter, clothes, towels, and bedding should be washed in hot water (at least ((convert|50|C|F|disp=or))) and dried using a hot cycle. The itching can be treated with topical and systemic [[corticosteroid]]s and [[antihistamine]]s. In case of secondary infections, antibiotics can be used to control the bacterial infection. When regular changing of clothes and bedding is not possible, the infested items could be treated with insecticides.

== Diseases caused ==

Unlike other species of lice, body lice can act as vectors of disease. The most important pathogens which are transmitted by them are ''[[Rickettsia prowazekii]]'' (causes [[epidemic typhus]]), ''[[Borrelia recurrentis]]'' (causes [[relapsing fever]]), and ''[[Bartonella quintana]]'' (causes [[trench fever]]).

Epidemic typhus can be treated with one dose of [[doxycycline]], but if left untreated, the fatality rate is 30%.<ref name=":1" /> Relapsing fever can be treated with [[tetracycline]] and depending on the severity of the disease, if left untreated it has a fatality rate between 10 and 40%.<ref name=":1" /> Trench fever can be treated with either doxycycline or [[gentamicin]], if left untreated the fatality rate is less than 1%.<ref name=":1" />

== See also ==
* [[List of parasites of humans]]

== References ==
((Reflist))

== External links ==
* [http://entomology.ifas.ufl.edu/creatures/urban/human_lice.htm Body and head lice] on the [[University of Florida|UF]]/[[Institute of Food and Agricultural Sciences|IFAS]] Featured Creatures Web Site

((Human lice))
((Pediculosis, acariasis and other infestations))
((Psocodea|2))
((Taxonbar|from=Q549378))
((Authority control))

[[Category:Ectoparasites]]
[[Category:Insects described in 1758]]
[[Category:Lice]]
[[Category:Parasitic arthropods of humans]]
[[Category:Taxa named by Carl Linnaeus]]

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