The most common type of worms in humans

Various types of worms are found everywhere, with children accounting for 80% of those affected.Helminths or worms (from the Greek word parasitic worm) are lower worms that are parasitic on the human body and animals.They cause pathologies called helminthiases.According to the WHO, every year 50% of the population is infected: pinworms (1.2 billion people), hookworms (900 million) and whipworms (up to 700 million).

What types of worms are there?To date, more than 400 species of worms found in humans have been identified.All types of worms in humans are divided into 2 large groups: flat and round (nematodes).On the other hand, flat ones are divided into tapeworms (cestodes) and flukes (trematodes).Cestodes are also divided into tapeworms and tapeworms.

The opinion that worms in humans only live in the intestines is a misconception;they can migrate with the bloodstream throughout the body and settle in various places.All types of parasitic worms feed at the expense of their host and use it for their life cycle.

The circulation of worms in nature

To preserve their species, parasites must constantly move to the external environment, leave their host, and settle in the animal's body, using it as an intermediate host.In this process, the carrier is very important: mechanical - these can be insects that carry worms over long distances on their legs.Worms do not live in the body of an insect.

Certain carriers or intermediate hosts - in which the parasites undergo only one cycle of their development.When circulating, the method of transmission of worms is important:

• contact - penetration through intact skin and mucous membranes (hoeworm);
• nutrition.

Peculiarities of worm reproduction

For the most part, the lower worms are hermaphrodites, but there are also worms with gender differences - nematodes.If helminths change several hosts during their development cycle (sometimes up to 4), they are called biohelminths.If they live with only one owner, they are geohelminths.

Stages of worm development:

1. Egg stage - females lay immature eggs, which mature in the external environment, and then return to humans orally.
2. The second stage is when the larvae hatch from the eggs.This process occurs in the gastrointestinal tract.It migrates throughout the body, looking for an ideal habitat.After finding it, it continues to grow into an adult.
3. The third stage is an adult, which again lays eggs.It should be noted that worms do not develop in all organisms, but only in those that are suitable for themselves, that is, for example, larvae, whose hosts are ungulates, will survive if they enter the predator's body, but they will not lay eggs there.

Types of helminthiases

Types of helminths in humans are divided according to their habitat: luminal and tissue.In the first case, the parasite lives in the lumen of a hollow organ, most often the intestine: ascariasis, trichuriasis, strongyloidiasis, teniarynchiasis and others.Living tissue in the thickness of various organs and tissues.What organs can worms affect?They can settle and affect the hepatobiliary system, brain, eyes, lymph nodes, lungs, so the disease can have several names:

• for liver damage - echinococcosis;
• brain damage - cysticercosis;
• lymph nodes - filariasis;
• pulmonary helminthiasis - paragonimiasis;
• tissue helminthiasis - with worm names: trichinosis, schistosomiasis, filariasis, toxocariasis.
• ophthalmic helminth infection - when the parasite affects the eye, and more significant pathological changes are caused by the larvae and developmental stages of the worm.

Habitat

Parasitic worms are found from the Arctic to the Equator, but worms characteristic of tropical regions will not be diagnosed in residents of northern latitudes.The level of infection of the population with helminth infections depends on the economic level of the country and the climate.The most common types of worms are pinworms, roundworms, and whipworms.The source of infection becomes the organism - the final host.

Ways of infection with worms:

1. The feeding route is eating unwashed or fly-infested food, insufficient heat treatment of meat, eating raw fish, drinking uncooked water, swallowing water while swimming in a reservoir, using the same knife for raw and cooked food.
2. Fecal-oral transmission: contaminated household items, unwashed hands after using the toilet, contact with animals.
3. Delivery route.Infection through insect bites.

Infection from pets

By coming into contact with dogs, you can become infected with tapeworms, echinococcus, roundworms, and pig tapeworms.Worm eggs can be on a dog's fur, and besides, these animals have a habit of eating other people's feces while walking.From cats: the same as in dogs, as well as cat fluke, from chickens - roundworms, from humans - pinworms, dwarf and pig tapeworms, hookworms.

How do worms act on the body?

Parasites flood the body with waste products, toxins and enzymes, resulting in:

• allergies and intoxication;
• mechanical damage to the mucous membrane with suction cups and hooks;
• Large worms can block the intestinal lumen.
• in addition, worms eat a large part of the incoming BZHU, which causes anemia, lack of vitamins, microelements, hypoxia, malnutrition;
• digestive disorders are observed, children have lags in psychophysical development.
• With many helminthiases, chronic microblood loss occurs.
• Helminths aggravate the course of existing pathologies, suppress the immune system, they increase the risk of tuberculosis and cancer, and reduce the effectiveness of vaccination.

The most common characteristics of worms

What does a roundworm look like?When cut, they have a round shape, which is why they got their name.Ringworms have their own characteristics.First of all, this is their incredible durability: they remain alive in formaldehyde for 5 years.In addition, they are distinguished by a simple development cycle, a digestive system in the form of a straight tube, and rapid reproduction.

Pinworms cause enterobiasis (anthroponotic disease, dirty hands disease).They look like small white worms up to 1 cm (male only 3 mm), the tip of the body is slightly pointed.They live in the lower part of the small intestine and the early part of the large intestine.They are contact worms.Spawning occurs in the anal area.The development cycle lasts for 2 weeks, they live for 1-2 months.More common in children.They are attached to the intestinal wall using head vesicles.Female pinworms descend into the anus in the evening and lay eggs here.At the same time, they release a special liquid that causes itching.A child scratches his bottom, and self-infection occurs.After laying eggs, the female dies.The harm they cause is the release of enzymes that irritate the intestinal wall and contribute to its inflammation.

Roundworms cause ascariasis.These are reddish-white roundworms up to 50 cm long and up to 6 cm wide.Males have a curved tip.Roundworms live in the small intestine, but the larvae actively migrate throughout the body, their life cycle reaches up to a year.Worm larvae live in the lungs.Their waste products cause hangovers and intestinal obstruction.

Parasites are geohelminths, that is, they develop in the soil and from there they reach humans.They are distinguished by their enormous fertility, up to 240 thousand eggs per day.Eggs have a three-layered shell that is very strong and easily falls into the ground.Here, under the influence of oxygen, humidity and a certain temperature, larvae are formed inside.This process can take from 2 weeks to several months, depending on the temperature.Mature eggs with larvae again enter the person orally.Larvae emerge in the intestine and are carried throughout the body through the bloodstream.Its favorite habitat is the alveoli of the lungs, because there is access to oxygen and the larvae are aerobic.Adults are anaerobes.After reaching 3-4 mm in length, after 4-5 days the larvae move to the bronchi, which causes coughing.When coughed up, it is swallowed and returned to the intestine, where it grows to maturity.The life cycle of the parasite reaches up to a year.

Whipworm causes trichuriasis, belongs to nematodes, has a color from gray to reddish, reaches 2-5 cm, has a sharp hair-like head tip, which is why it got its name.The parasite clings to the intestinal wall and feeds on the host's blood and mucosal tissue.It inhabits the large intestine and appendix, where the larvae reach sexual maturity and lay 3.5 thousand eggs per day.The life cycle of the parasite is 4-5 years.By damaging the intestinal wall, they contribute to its damage: causing appendicitis, diarrhea, stomach pain, anemia.Helminth eggs enter the soil with human feces, where they can survive for up to 2 years.

Toxocara causes toxocariasis.These are yellowish worms that resemble roundworms, but are 15-20 cm long.It is a biohelminth;humans are infected by dogs.They live in egg form.In the human intestine, larvae emerge from them.They migrate throughout the body, damage internal organs and cause allergies.Clinical severity depends on immunity and the number of helminths.Lay eggs every day - up to 250 thousand.Life cycle - up to 10 years.

Trichinella spiralis causes trichinosis, which is considered the most dangerous of helminthiasis, because it often ends in death.Nematodes are only 5 mm long.Attacks occur when eating poorly cooked pork.Trichinella in the intestine is fertilized, the larvae digest and hatch in the female.At one end, the female attaches to the intestinal wall and discards up to 2 thousand live larvae.This process is called ovoviviparity and takes 3-4 days.Larvae are carried through the bloodstream and settle in striated muscles, especially in masticatory, oculomotor, respiratory tract, and shoulder flexors.The disease is severe: 2 weeks after the invasion, pain in the stomach, muscles, head and joints, fever, swelling of the face, and intoxication appear.In the muscle, after a month, the larvae are wrapped in a spiral and can remain in a cyst-like state for 20 years without losing their vitality.After 1.5 months, recovery occurs with proper treatment.

Hookworm and necator are similar to each other, so their helminthiasis is given a common name - hookworm.They are up to 1.5 cm long and duodenal parasites.Helminths are common, but rarely detected.Larvae can penetrate the skin when in contact with soil.The developmental cycle is very similar to that of roundworms.Worms live in the intestines and only feed on blood.An individual can absorb 0.35 ml of blood per day.Therefore, the characteristic features are anemia and dysproteinemia.

Flatworms have a flat shape.They have no gender difference;they are hermaphrodites.It is attached to the intestine using a hook and a suction cup.

Bovine tapeworms are tapeworms that cause taeniahrynchiasis.It has a small head with 4 suckers and 6 hooks and a ribbon body of 1000 segments, reaching 20 m in length.Parasites are biohelminths, infection occurs through beef, where the larvae are.Each segment contains hundreds of thousands of eggs.Without treatment, tapeworms are parasitic in humans for up to 20 years.It lives in the small intestine, sucking nutrients to the entire surface of the body.Live up to 10 years.

Pig tapeworms are tapeworms that cause taeniasis or cysticercosis.reach 3-8 m and have a double hooked rim.The life cycle is from 20 to 30 years.It can live in any organ and is found with undercooked pork.This cycle is similar to a bullish tapeworm.These tapeworm segments can crawl out of the anus, here on the surface of the skin they break and the eggs come out.Helminths parasitize the intestines, causing allergies and gastrointestinal problems.

Broad tapeworms cause diphyllobothriasis.The parasite is more than 10 m long, it is flat and wide.Biohelminths reach humans through freshwater fish or crustaceans.For decades, parasitic worms in the small intestine, clinging to its walls.In 25 days, the parasite develops into an adult.They feed on blood, causing diarrhea and abdominal pain.

Echinococcus is a biohelminth, a small tapeworm, up to 3-5 mm.Above his head are 2 corollas of hooks and suckers;the parasite has 4-5 segments.The last is its reproductive system.In the organ it forms cysts up to 10 cm (Fin), where eggs and larvae are located.The cyst destroys the surrounding tissue.They can burst, then toxic shock or several new cysts develop.The final owner is a wolf, the middle owner is a human.Infection through eating or after contact with domestic animals.In the intestine, larvae (oncospheres) emerge from the eggs and are carried throughout the body through the bloodstream.They settle, as a rule, in the parenchyma of the liver and lungs, but also live in the intestines.Cysts can only be removed surgically.

Cat fluke is liver fluke, cat fluke, or Siberian fluke.Causes opisthorchiasis.It has a lancet shape, 1-2 cm long and 2 mm wide, with 2 mouth suckers on the head.People become infected through infected freshwater fish that have eaten snails or crustaceans with worm eggs.Humans are the primary host.Parasites live in the lumen of the small intestine and bile ducts.The life cycle is up to 20 years;thousands of individual parasites in one organism at once.The acute phase of the disease is characterized by pain in the upper abdomen, fever, nausea, myalgia, diarrhea, and rash.When the process becomes chronic, symptoms of hepatocholecystitis are observed, and they do not disappear even after the worms are removed.

Disease course and symptoms

During the acute phase, symptoms may appear at different times, depending on the incubation period, but most often begin after 2-3 weeks.The most common symptoms: allergic rash, lymphadenopathy, development of local or general edema, arthralgia and myalgia.When migrating to the lungs, there may be coughing, shortness of breath, stool disorders (diarrhea), nausea and vomiting.

In the chronic phase, symptoms depend on the organ where the parasite has settled and its number.Key features include:

• frequent itching in the anal area;
• headache;
• dizziness;
• sleep disorders;
• flatulence;
• rash and itching;
• fatigue with increased appetite;
• joint and muscle pain;
• yellowing of the skin;
• tiredness
• prolonged low-grade fever may occur;
• discomfort in the umbilical region or in the right hypochondrium;
• periodic nausea and vomiting;
• bruxism;
• indifference.

Patients have pale, dry skin, hair loss, eyebrows, eyelashes, brittle nails, tooth decay, bleeding gums, and bad breath.

Diagnostic and preventive measures

To make a diagnosis, scrapings are taken from the rectal and perianal areas, and stool analysis is also performed.In this case, the worms can be clearly seen under the microscope.Blood tests are taken for eosinophils and protein balance.Phlegm, stomach and duodenal contents can be examined.

Any helminths in humans are prevented by constant personal and public hygiene, adequate heat treatment of meat and fish.Regular veterinary checkups and follow-up treatments for all pets are necessary.