Site about the fight against domestic insects

Pubic lice: photos and lifestyle features


Знакомимся с особенностями внешнего вида и биологии лобковых вшей

Pubic lice are human parasites, their way of life is very different from other bloodsucking insects. They are also called ploschitsami, and the complex of symptoms caused by infection with them - pubic lice. Also, the effects of bites of pubic lice and skin irritations from them in medicine are usually called phthiazia - from the generic Latin name of the Phtirusinguinalis carpenters themselves.

Другое распространенное название лобковой вши - площица

Due to the fact that infection with pubic lice does not manifest immediately, and the symptoms characteristic of it appear only a few weeks after infection, the carpenter carrier can infect other people for a long time without even knowing it. It is not at all necessary that the pubic louse will parasitize only on a person living in unsanitary conditions and not adhering to the basic rules of hygiene. The lice are equally fit and not long washed people, and well-groomed, and they can infect any person.

Pubic louse significantly differs from lice head as in appearance, and way of life. Systematically, these are two different types of insects that are incapable of interbreeding, and even usually do not occur with each other if one person is infected. Therefore, approaches to fighting pubic lice have their own characteristics.

На фотографии показана головная вошь в момент укуса: хорошо заметно, как сильно она отличается по внешнему виду от лобковой вши.

Appearance of pubic lice



Externally, the pubic louse is a small insect that is usually light brown in color. The length of her body is about 2 mm, and in larvae - from 0.7 mm. Interestingly, because of the strong and massive legs when they are placed in the sides, the pubic louse appears to have a width greater than the length.

The color of pubic lice is slightly brown. On the pubic hair, thanks to this, it is hardly noticeable, which is further enhanced by the overall structure of the hair on this part of the body.

In the photo - pubic lice on the hair:

Лобковые вши на волосах человека

Помимо собственно лобковых вшей можно также разглядеть многочисленные гниды на волосах

And on the next photo - a pubic louse under a microscope at a large magnification:

Так выглядит лобковая вошь под электронным микроскопом

At the same time, it is difficult to identify the carpenter by the appearance with the naked eye. It looks like just a small seal on the hair. In addition, when they are usually near the base of the hair, they are less conspicuous.

Pubic lice are well adapted for retention on hair. They have strong paws with the likeness of claws at the ends, and the shape of the body, which contributes to tight pressing against the hair itself.

But with the same seemingly relatively massive paws, the louse moves quickly enough over the surface of the skin, searching for a place for a bite. In the picture below, you can consider the details of the structure of the body of the pubic lice:

На этой картинке можно рассмотреть отдельные подробности строения лобковой вши

Larvae of pubic lice are much smaller than adult parasites, and in the early stages of their development they are just over half a millimeter in length. The photo clearly shows how the larva of the pubic lice look when magnified under a microscope:

Личинка лобковой вши немного напоминает микроскопического краба

Pubic lice are difficult to confuse with other human parasites. In addition, only mites can bite in the pubic region, but the tick is a large parasite. In addition, ticks can not move through the hair and have four pairs of legs, while the lice have only three pairs:

У клещей 8 лапок, а у вшей их всего 6.

Bed bugs are much larger than pubic lice, and fleas jump very well. The ploschitsa has neither wings, nor powerful jogging paws, and therefore only knows how to crawl.

Here are a few photos of pubic lice:

Лобковая вошь под микроскопом

Хитиновый покров лобковых вшей полупрозрачный, что делает их менее заметными на теле человека

Еще одно фото лобковой вши под электронным микроскопом

It is important that even knowing how pubic lice look, identifying them at once is quite difficult because of their small size. After watching the photos under a microscope, some people think that they will meet on the body of characteristic "crabs" and even do not pay attention to the tiny dark dots on their hair. The photo below shows how pubic lice look like without increasing, under normal conditions:

А так выглядят паразиты и их гниды на волосах непосредственно в месте своего обитания

Lifestyle of carpenters

Pubic lice can live only on the human body. Unlike other parasites living in furniture, garbage or natural surroundings, and people climbing only for food, lice do not leave the hairy parts of the body at all. And all of their evolutionary adaptations are aimed specifically at adapting to the constant presence on the body of people.

The photo below shows the pubic lice:

Вши на лобке

If a louse for some reason is removed from the pubic hair and falls on the bed or in a natural setting, it is likely to die in a few days from hunger. In exceptional cases, if a naked person appears in the same place, the parasite can creep onto it. Usually, lice are rather inactive and they can not find a new master through long-distance movements.

On a note

Once again, we emphasize that pubic lice can parasitize only on a person. No other mammal is suitable for them. Accordingly, and you can get pubic lice only from people.

Ploshchitsy can hit the hair not only on the pubis. In more rare cases, they colonize the armpits, and can also occur on eyelashes and eyebrows. On the chest, beard and head pubic lice do not parasitize.

Лобковые вши могут обитать также на ресницах и бровях

Хорошо заметна вошь и гниды среди ресниц

Feedback

"Once at me the head was terribly combed and I was frightened, that it can be lice. I did not know if pubic lice could live on my head and thought I had contracted from an ex-girlfriend. Well, the doctor calmed me down. It was a simple allergy to a product (it was after the New Year). And in general she told me that pubic lice on her head are not found. That's why they are pubic. "

Ivan, Ivanovo

Pubic lice feed on only the blood of a person. To do this, they have small styloid-like outgrowths in their mouth, with which they pierce the skin and reach the blood vessels.

Puncture the wall of the vessel, the louse begins to expand the esophagus, sucking in the blood like a pump. In parallel, through a special channel, it injects into the wound an enzyme that prevents blood clotting and facilitates its flow into the stomach of the parasite.

From the piercing of the skin, a person can feel a very light prick, the enzyme itself causes an itch like what remains after a mosquito bite, and a slight swelling of the tissues in the bite area. That itch is the main disturbing symptom of pubic lice.

Next, you can see the photo bites of pubic lice:

А вот так выглядят укусы лобковых вшей при несильном заражении паразитами

And the video below is taken of how the pubic louse feeds:

The pubic louse feeds several times a day, almost every 4-5 hours. For one feeding, the parasite sucks out about 0.5 mg of blood. Long louse can not stay hungry, and after 1-2 days of the hunger strike perishes.

The optimum temperature of development and reproduction of pubic lice is 30-31 ° C. At temperatures below 20 ° C and above 40 ° C, the development of eggs of lice (nits) ceases, and adults do not reproduce. At a temperature of about 1-3 ° C, lice and nits can survive for a week, and at minus 5 ° C and at + 55 ° C die within half an hour.

Pubic lice have reduced eyes, which practically do not see anything. Orientation of the scallop on the smell.

On a note

Pubic lice like moist air. In dry air, they lose mobility and easily fall from hair. This is used in American clinics, treating pubis of infected people with air from a hair dryer with a temperature of about 50 ° C, and after easily combing weakened parasites with special crests.

Reproduction of pubic lice



Pubic lice reproduce very quickly. Under suitable conditions, the whole life cycle of parasites takes about 16 days. Of them:

  • 5-7 days takes the development of the egg
  • about 13-17 days the larva develops, during this time, approximately at equal intervals, it experiences three molts
  • about noon an adult female is needed in order to free itself after molting from the larval membrane, drink blood, mate with the male and lay off the first egg.

На картинке показан жизненный цикл лобковых вшей

Eggs of pubic lice are called nits. They are a capsule firmly attached to the hair at a distance of 1-3 cm from the surface of the skin, with a lid and a small foot. With an unaided look, the louse eggs look like small light-colored dots on the hair. In length, the eggs reach 0.5-0.6 mm and have an almost circular shape.

Larvae of frontal lice are outwardly similar to adult insects and are therefore called nymphs. They also feed on blood and lead the same lifestyle as sexually mature carpels. They differ only in small sizes and lack of external genitalia.

It is interesting

Under a microscope, the nits of pubic lice are very different from nits of head lice. In the latter the eggs have an elongated, spindle-shaped shape. The photographs show the difference between eggs of pubic lice from nits of head lice:

Так выглядит гнида лобковой вши на волосе

Гниды головных вшей имеют более продолговатую форму

Each female lays 1 to 3 eggs per day. During its short adult life (sexually mature insect lives 20-30 days, in rare cases - up to 40), each female lays 30 to 50 eggs.

What can be dangerous pubic lice

In contrast to head and ward lice, plaids almost never suffer from infectious diseases. However, even their natural activity is already enough to cause a lot of unpleasant symptoms and consequences:

  • itching and bite marks
  • bluish spots on the places of bites, which are the reaction of the skin to lice produced by lice
  • papules and pustular inflammation at the site of combed bites, in especially neglected cases growing into pyoderma.

All these symptoms in the complex are called fthiracy.

Infection of the eyelids and eyebrows with pubic lice can lead to the development of conjunctivitis and blepharitis.

In the photo below you can see how the infection of the eyelids looks like pubic lice:

Еще одна фотография, где можно рассмотреть вшей и гниды на ресницах человека

Methods of transmission of pubic lice and general epidemiological situation

Pubic lice are transmitted almost exclusively during sexual acts, crawling from the hair of an infected person to healthy hair. Ftyariase is considered a sexually transmitted disease, equally common in both sexes. Pubic lice in men are found as often as in women. They can affect children.

It is interesting

In recent decades, scientists have noted a reduction in the number of cases of pubic lice infection due to the entry into the fashion of shaving pubic hair. Another century or two ago, pubis was shaved mainly by female workers of the ancient profession precisely for protection against lice. Today, with the cult of the hairless body, carpenters literally lose their habitat.

Pubic lice can survive up to two days in water and therefore in very rare cases are transmitted in swimming pools and open water between bathing people.

In general, pubic lice are most common in third world countries, especially in Africa, where unsanitary conditions and promiscuous sexual relations reign. It is the frequent change of sexual partners that causes the infection of pubic lice, and due to the fact that within a month after infection a person does not feel the symptoms of fthiracy, he can calmly infect other people. For this reason, lice successfully spread even in a society with a high level of sanitation.

Here are some more photos of pubic lice:

С помощью специальных крючков на лапках паразит прочно удерживается на волосе

Лобковая вошь при сильном увеличении

Ways to get rid of pubic lice

The most simple and effective way to destroy pubic lice is shaving the hair at the site of their dislocation. This procedure takes half an hour and guarantees complete disposal of parasites.

Harder to struggle with lice with the help of special shampoos and ointments. Such drugs should contain powerful insecticides such as Cypermethrin or Deltamethrin, which have a nerve-paralyzing effect on parasites, but harmless to humans. When the first hair treatment with such a preparation, active adult insects and larvae are destroyed, and in a second treatment, a week later, those larvae that were removed from the surviving nits.

To avoid infection with pubic lice, casual sexual intercourse should be avoided. For complete reliability, you can regularly shave your pubic hair, thereby protecting yourself from potential transmission of parasites.

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