Why you should know how to look lice and nits, to have an idea about the features of the structure and functioning of parasites? This information will help to protect against pests, quick to detect insects and to get rid of them.
Anastasia Pavlova December 12, 201711511
The content of the article
- 1 look Like the lice and nits
- 1.1 types of parasites
- 1.2 What is the difference
- 2 the Life cycle of insects
- 2.1 Fertilization and deposition of eggs
- 2.2 the development of the larvae
- 2.3 Output from the capsule
- 2.4 Transformation into an adult
- Than 3 dangerous head lice to humans
- 4 How can “hook up”
- 4.1 “Risky” public places
- 4.2 Common myths
- 5 the Incubation period
- 6 How to spot unwelcome “guests”…
- 7 … and distinguish from dandruff
- 8 How to hold your head examined
Lice – blood-sucking parasites that live on the body of mammals, including humans. In nature there are several varieties of insects, but each species can parasitize only in their environment. For example, the human louse will never settle in the dog’s coat.
Look like lice and nits
For the prevention and treatment of parasites it is important to know how lice are passed from person to person, to have an idea about the appearance, lifestyle pests.
Types of parasites
A person can suffer “attacks” of the three types of lice:
- head – a parasite in the scalp;
- pubic lives on the hair of the pubis, and sometimes the armpits, rarely in eyebrows and eyelashes;
- a – “live” in the folds and seams of clothing, bedding.
In laboratory conditions, these species interbreed, produce fertile offspring, but in the natural environment insects exist in isolation from each other.What is the difference
In the hair the head louse is a parasite that often infest and nits. Some believe that NIT is a separate kind of parasites, sucking blood, some say it’s the same thing. Such point of view is incorrect. For effective pest control you need to know what is the difference between lice from nits.
A louse is a grey – brown bug the size of 0.4-6 mm, with six legs. NIT – covered with a special shell of the egg lice. “Cocoon” has a spindle shape and “cap” through which the Mature larva emerges from the capsule. Below is a zone of grasping the egg and the hair, which is attached. The length of the NIT – 0.7-0.8 mm, capsule diameter of about 0.4 mm.
Outside of the human head lice do not live more than two days – so much time they can survive without food. If the ambient temperature drops to 10-12°C, pests can “stretch” longer – about ten days.The life cycle of insects
Life cycle of head lice that live in human hair, consists of four stages.
Fertilization and deposition of eggs
To produce offspring capable of a louse, which is about two weeks. After fertilization, the male and the “meal” the female lays eggs. It happens this way.
- The maturation of the eggs. While the lice moving through the hair up on the oviduct in the body of the insect drops the egg, passing through the gland, covering it with a special compound.
- The output of eggs. Through the secret of the egg, leaving through the anus, attached to the hair at a distance of 2-3 cm from the root.
- Attaching to the hair. A few minutes later, the shell becomes so strong that to remove the nits with curl is not possible even nails.
Louse chooses for laying eggs free of hair. On one strand may be more than one nits only if insects very much.The development of larvae
In the cocoon the larva develops in five to eight days. Ripening time depends on the environmental conditions. For nits optimum temperature 33 °C. When the rate drops to 22 °C. or increased to 40 °C, insect development stops.
At temperatures over 45 °C the larva dies, at 0 °C will persist for two to three months. However even in winter the temperature of the scalp in humans rarely falls below 25°C, so the lice can thrive all year round.
The output from the capsule
Mature larva presses the cap of the cocoon and begins to breathe. Inhaled air passes through the esophagus of the insect and, exiting via the anus, accumulates in the lower part of the shell. Under pressure, the larva is expelled from the cocoon. The “birth” takes only a few minutes.
The transformation into an adult
Emerging from the egg the larva resembles the adult, but smaller in size, are not able to produce offspring. For 14-16 days, the insect grows, this period is three molting. After the last pest is able to multiply, what does, almost immediately, pairing with individuals of the opposite sex.
Breed lice on the head very quickly. Each female, under favorable conditions, lays about ten eggs per day.How dangerous head lice to humans
If the human head louse is a parasite, we can talk about this disease, as lice. Its danger to humans is associated with five factors.
How can “hook up”
The doctors found out where are the lice in man, and as they crawl with a sick head on healthy. Revealed two ways of infection of head lice.
Nits, unlike head lice, can be spread from person to person in exceptional cases, as they are tightly coupled to the hair.”Risk” public places
To pick up lice anywhere by close contact with an infected person or using his personal belongings. This occurs most often in:
- public transport;
Head lice can be transmitted even in public baths, for example, in the pool. In poor areas of India contamination often occurs while bathing in the river.
Indulging in some word of mouth information about lice incorrect. Here are five of the most common myths.
There is a perception that lice can appear in the nervous system. Oddly enough, this is partly true. There is evidence that insects often “attack” those who are prone to anxiety and worry. Such people strongly pulsing blood, excessive perspiration, smell of their body is attractive to insects.The incubation period
In biology, the incubation period of insect development time of the eggs of lice. In medicine incubation period of the disease called the time between exposure and onset of symptoms. For the entomologist the incubation period of lice and nits – five-eight days for a person who is “landing” parasites three to four weeks.
When lice “settle” on the head, they start to bite immediately, but with a slight amount of insects person does not give unpleasant sensations special value. Only after three to four weeks when pests become much signs of their presence be felt.How to detect uninvited “guests”…
The first symptom of lice on the head, itchy skin. After the bite of a pest is wound is formed, which gets its saliva, causing irritation. When a little lice, itching minor, it is rarely associated with the presence of insects. However, the more they become, the more intolerable these feelings.
The emergence of itching does not mean the infestation of head lice, confirm the diagnosis can only detect insects and nits. Adult lice are quite difficult to see: they live on the skin and quickly moving. Most often first detected nits. To see the bright capsules with eggs naked eye, they are particularly noticeable on dark straight hair. Sometimes nits are mistaken for dandruff.
… and distinguish from dandruff
Distinguish dandruff from nits is possible on four grounds.
How to hold your head examined
To detect lice is difficult, especially if the hair is light and curly, or pests not so much. The only sure way – combing with a special comb with frequent teeth. It is desirable to entrust the inspection personnel, but it is possible to carry out the procedure at home.
How to act
Knowing how to look for the lice on the head, to detect them easily. The most difficult to get rid of insects, and this should be done immediately, because the fewer the parasites, the easier it is to bring them out.
Look like head lice nits, where and how is transmitted, the incubation period of head lice and symptoms