Are Crabs The Same As Head Lice – As the name suggests, barley lice are parasites that live in the genitals of men and women, especially under the pubic hair. These tiny worms are commonly found in people with sexually transmitted infections. Head lice are smaller than head and body lice. Less commonly, crab lice can also infest the eyelashes, armpit hair, leg hair, and facial hair (such as the mustache and beard), as well as various ingrown hairs.
Because of their crab-like appearance, head lice infestations are also called crabs. When viewed under a magnifying glass, the parasite has six legs; Two very large claw like front legs (hence the nickname, crab). Adult female lice lay eggs and are larger than male lice. It should be noted that crab lice are not transmitted from animals.
Are Crabs The Same As Head Lice
According to a new study reported in the peer-reviewed Journal of Sexually Transmitted Diseases (2), the prevalence of head lice in the general population ranges from 1.3% to 4.6%.
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Head lice infection is usually caused by sexual contact with someone who is already known to have head lice. In addition to being in close proximity to an infected person, community lice can also be spread by sharing personal items such as blankets, towels, or clothing; However evidence is scarce. Children can get crab lice from sleeping in the bed of an infected person. To survive, adult lice must feed on human blood. If a head lice falls off a person’s skin, it usually dies within 1-2 days. In addition, head lice infestation in children can also be a sign of child sexual abuse. Pubic hair in children usually appears on the eyebrows and eyelashes.
Crayfish lay eggs under the hairs near the skin. These eggs are called nits. After seven to ten days, the eggs hatch into nymphs, which feed immediately on human blood and develop into adults within 2–3 weeks to continue the reproductive cycle. Because lice cannot fly or crawl on non-physical surfaces, close physical contact is usually the most common mode of transmission (3).
The most prominent symptom of a crab lice infestation is itching throughout the groin area and/or anus, which may worsen at night. The discomfort usually begins five days after infection. Excessive itching can lead to scarring and infection. You may see eggs (also called nits) crawling on your skin or hair attached. Other symptoms include:
According to a case study reported in the New England Journal of Medicine (1), the clinical presentation of a 6-year-old child was typical for erythema (or reddening of the eyelids) as well as itching that was initially mistaken for allergic conjunctivitis. Was considered. , or atopic. Dermatitis The infection can be completely eradicated with proper treatment.
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The diagnosis of digestive lice is usually clinical. Affected individuals usually suspect crabs by carefully examining the barley hairs through a magnifying glass under a bright light. The hairs are brown, but they turn black after sucking human blood. The eggs are very small and white in color and are usually located around the roots of the pubic hair.
1. Micali, G., & Lacrubba, F. (2010). (2015). Phthiriasis Palpebrarum in a child. New England Journal of Medicine, 373(27), e35.
2. Dholakia,S., Buckler,J., Jeans,J. P., Pillai, A., Eagles, N., and Dholakia, S. (2014). Mass Dressing: An Endangered Species? Sexually Transmitted Diseases, 41(6), 388-391.
3. Bonilla, D.L., Durden, L.A., Yeremeeva, M.E., & Dash, G.A. (2013). Pediculosis and infectious diseases: problems in diagnosis, treatment, prevention, and control. PLOS Pathogenesis, 9(11).
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Humans are the only hosts of this parasite, while chimpanzees and bonobos carry Pediculus chaffei, a closely related species. Many other types of lice infest all types of mammals and birds.
Bats cannot fly, and their short, stubby legs prevent them from jumping or walking on flat surfaces.
Carrier head lice differ from body lice (Pediculus humanus humanus) in their preference for laying eggs in hair rather than clothing. The two subspecies are morphologically nearly identical, but are not usually interbred. It is estimated that they split into a subspecies about 30,000–110,000 years ago, when most humans began to wear large amounts of clothing.
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The hair louse, pubic louse or crab louse (Pythirus pubis), a closely related species, also infests humans. It is morphologically distinct from the other two species and is closely related to lice infesting other primates.
Having body lice is called pediculosis, pediculosis for head lice, pediculosis corporis for body lice, and phthiriasis for head lice.
Scabies (especially in children) is still being carried out in various campaigns to eliminate them. Unlike body lice, head lice do not carry any known disease, although rare secondary infections can occur from scratches when they bite. Getting rid of head lice can help people develop a natural anti-lice response that helps protect them from dangerous body lice that carry dangerous diseases.
Like other insects of the suborder Anopleura, adult head lice are small (2.5–3 mm long), flattened (see Topoanatomical terminology), and wingless.
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The thoracic segments are confluent but otherwise distinct from the head and abdomen, the latter having distinct segments.
The hairs and head are brown, but their exact color varies depending on the climate in which they are grown.
A pair of five-segmented antennae emerge from the insect’s head. Cephalopods also have a pair of eyes. The eyes are deformed in all species of the family Pediculidae, but more or less so in most other members of the suborder Anopleura.
Like other members of Anopleura, the hollow mouthparts are suitable for piercing the skin and sucking blood.
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As is typical of Anopleura, these feet are short and end with a claw and an opposable “toe”.
With their short legs and large claws, raccoons are well adapted to clinging to their owner’s hair. This adaptation does not allow them to be efficient at jumping or walking on smooth surfaces. Flies can quickly climb up the hair shaft, allowing them to move quickly and reach another host.
In male lice, the front two legs are slightly larger than the other four. This specialized pair of legs is used to hold the female during copulation. The male is slightly smaller than the female, with a pointed abdomen d and a well-developed hiatal apparatus visible inside the abdomen. Two W-shaped gonopods are found in the abdomen of the mothers. d.
Like most insects, head lice are egg-laying. The female lays three to four eggs per day. Lice eggs (also known as nits) lay near the base of the host’s hair shaft.
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In warm climates, and especially tropical regions, the seed may be placed 6 inches (15 cm) or more up the hair shaft.
To attach the eggs, the adult female secretes glue from her reproductive organs. This glue quickly forms a “normal shell” that covers the hair shaft and most of the egg, except for the operculum, through which the embryo breathes.
Previously, this glue was based on chitin, but direct studies have shown that it consists of proteins similar to hair keratin.
They are shiny, transparent, and brown in color in the embryo, but turn white after hatching.
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After hatching, lice leave their eggshells still attached to the hair shaft. It may take six months or more until the loose skin is physically removed by abrasion or the host, or until it gradually dissolves.
The empty shells are dull, scaly and white in colour. The term knit may include any of the following:
However, it is a common public health measure to prevent the transmission of head lice. Therefore, some authors restrict the definition of nit to describe only hatched or non-viable eggs:
In many languages, as is well known, words used for fertilized eggs are used for later fertilized eggs, which is difficult to define. Thus, in Glish the word “nit” is often used for both. However, over the years, my colleagues and I have felt the need for some simple means of differentiating between the two without labor qualification. Therefore, we reserve the term “nit” for hatchlings and empty eggshells, and call the developing embryo an “egg”.— Ian F. Burgess (1995) 
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In the United States, the term “nit” refers to any egg regardless of viability.— Terri Lynn Meinking (1999) 
Because nits are eggshells and can be contained in
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