The most common types of worms in humans

Many types of worms are found everywhere, with children accounting for 80% of infected people.Helminths or worms (from Greek parasitic worms) are low-level worms that parasitize the bodies of humans and animals.They cause diseases called helminths.According to WHO, every year 50% of the population is infected with: 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 human worms are divided into 2 large groups: flat and round (nematodes).In turn, flatworms are divided into tapeworms (cestodes) and trematodes (trematodes).Cestodes are also divided into tapeworms and tapeworms.

The notion that human worms live only in the intestines is a misconception;They can move through the bloodstream throughout the body and settle in many different places.All parasitic worms feed on their host and use it during their life cycle.

Circulation of worms in nature

To preserve their species, parasites must constantly move into the external environment, leave their hosts and settle in the bodies of animals, using them as intermediate hosts.In this process, the carrier is of great importance: mechanical - these can be insects that carry worms over distances on their legs.Worms do not live inside insects.

A specific carrier or intermediate host - in which the parasite undergoes only one of its developmental cycles.When circulating, important methods of worm transmission are:

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

Reproductive characteristics of worms

Most lower worms are hermaphrodites, but there are also worms with sexual differences - nematodes.If helminths change multiple hosts during their developmental cycle (sometimes up to 4 hosts), they are called biological worms.If they only live with one owner, they are earthworms.

Stages of worm development:

1. Egg stage - the female lays immature eggs, which mature in the external environment and then return to the human via the mouth.
2. The second stage is when the larvae hatch from the eggs.This process occurs in the digestive tract.It moves throughout the body, looking for an ideal living environment.Once found, it continues to develop into an adult.
3. The third stage is the adult and lays eggs again.It should be noted that worms do not develop in all organisms, but only in those that are suitable for them, for example, larvae, whose hosts are ungulates, will survive if they enter the body of a predator, but they will not lay eggs there.

Types of helminths

Types of human helminths are divided according to their habitat: lumbar and tissue.In the first case, the parasites live in the lumens of hollow organs, usually the intestines: roundworm, whipworm, strongyloidiasis, teniarinchia and others.Tissues live in the thickness of various organs and tissues.What organs can be affected by worms?They can deposit and affect the hepatobiliary system, brain, eyes, lymph nodes, and lungs, so the disease can have many names:

• for liver damage - echinococcosis;
• brain damage - cystic disease;
• lymph nodes - filariasis;
• paragonimiasis; paragonimiasis;
• helminthiasis - by the names of the worms: trichinosis, schistosomiasis, filariasis, toxocariasis.
• ocular helminth infection - when parasites affect the eyes and more pronounced pathological changes are caused by the larvae and developmental stages of the worm.

living environment

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

Ways of worm infection:

1. The nutritional path is to eat unwashed or fly-infested food, meat that has not been thoroughly heat-treated, eat raw fish, drink unboiled water, swallow water while swimming in a tank, and use the same knife for raw and cooked food.
2. Transmission through the fecal-oral route: contaminated household items, unwashed hands after using the toilet, contact with animals.
3. Transmission line.Transmitted through insect bites.

Infection from pets

When coming into contact with dogs, you can be infected with tapeworms, echinococcus, roundworms and pork tapeworms.Worm eggs can stick to dog fur. In addition, this animal also has the habit of eating other people's feces when walking.From cats: the same as in dogs, as well as cat flukes, from chickens - roundworms, from humans - pinworms, dwarf and pig tapeworms, hookworms.

How do worms work on the body?

Parasites sensitize the body to their waste products, toxins and enzymes, leading to:

• allergies and intoxications;
• mechanical damage to the mucous membrane with suction cups and hooks;
• Large worms can block the intestinal lumen.
• In addition, the worms eat a significant portion of the incoming BZHU, causing anemia, lack of vitamins, trace elements, lack of oxygen, malnutrition;
• recorded digestive disorders, children had slow mental and physical development.
• With many helminth diseases, chronic microscopic blood loss occurs.
• Helminths aggravate the existing pathological process, suppress the immune system, they increase the risk of tuberculosis and cancer, and reduce the effectiveness of vaccinations.

Characteristics of the most common types of worms

What do roundworms look like?When cut, they have a round shape, which is why they got their name.Roundworms have their own characteristics.First of all, this is their extraordinary endurance: they remain alive in a formaldehyde environment for 5 years.In addition, they are distinguished by their simple development cycle, straight tube-shaped digestive system, and rapid reproduction.

Pinworms cause intestinal diseases (human disease, dirty hands disease).They look like small white worms up to 1 cm long (males are only 3 mm), the end of the body is slightly pointed.They live in the lower part of the small intestine and the first part of the large intestine.They are contact worms.Egg laying occurs in the anal area.The development cycle lasts 2 weeks, they live 1-2 months.More common in children.They are attached to the intestinal wall by vesicles at the tip.Female pinworms descend into the anus at night and lay eggs here.At the same time, they secrete a special liquid that causes itching.The child scratches his buttocks 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 inflammation.

Roundworms cause ascariasis.These are red-white roundworms up to 50 cm long and up to 6 cm wide.Males have a curved head.Roundworms live in the small intestine, but the larvae actively move throughout the body, their life cycle is up to a year.Worm larvae live in the lungs.Their waste causes poisoning and intestinal blockage.

The parasites are earthworms, meaning they grow in the soil and from there are transmitted to humans.They are distinguished by their enormous fertility, up to 240 thousand eggs per day.Eggs have a very sturdy three-layer shell and fall easily to the ground.Here, under the influence of oxygen, humidity and certain temperatures, larvae form in it.This process can take from 2 weeks to several months, depending on the temperature.A mature egg containing such a larva enters a person through the mouth.The larvae appear in the intestines and are carried throughout the body by the blood.Its favorite habitat is the alveoli of the lungs, because of its access to oxygen and aerobic larvae.Adults are anaerobic bacteria.When reaching a length of 3-4 mm, after 4-5 days the larvae move into the bronchi, causing cough.When coughed up, it is swallowed and returned to the intestines, where it develops into an adult.The life cycle of the parasite is up to one year.

Roundworms cause trichotillomania, a type of roundworm, gray to reddish in color, up to 2-5 cm long, with a pointed tip like a feather, hence its name.The parasite attaches 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, abdominal pain, anemia.Helminth eggs enter the soil in human feces and can survive up to 2 years.

Toxocara causes toxocariasis.This is a yellow worm that looks like a roundworm but is 15-20 cm long.It's a biological worm;Humans are infected with the disease from dogs.They live in egg form.In the human intestine, larvae appear from them.They move throughout the body, damaging internal organs and causing allergies.The severity of the disease 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, considered the most dangerous of the helminth diseases because it often leads to death.Nematodes are only 5 mm long.Infection occurs when eating undercooked pork.Trichinella in the intestine is fertilized, the larvae become pregnant and hatch inside the female's body.At one end, the female clings to the intestinal wall and throws out up to 2 thousand living larvae.This process is called ovoviviparity and takes 3-4 days.The larvae are carried by the bloodstream and settle in striated muscles, especially in the muscles of mastication, oculomotor, respiratory tract, and shoulder flexors.Severe disease: 2 weeks after invasion, pain in the abdomen, muscles, head and joints appears, fever, facial swelling, and intoxication.In the muscle, after a month, the larvae are enclosed in a spiral form and can exist in a cyst-like state for 20 years without losing the ability to survive.After 1.5 months, recovery occurs if appropriate treatment is given.

Hookworm and nekator are similar, so their helminth disease is given the common name hookworm.They are up to 1.5 cm long and parasitize in the duodenum.Helminths are common but rarely detected.The larvae can penetrate the skin upon contact with soil.The development cycle is very similar to that of roundworms.Hookworms live in the intestines and only suck blood.A person can absorb 0.35 ml of blood per day.Therefore, a characteristic feature is anemia and dysproteinemia.

Flatworms have a flat shape.They have no gender differences;they are hermaphrodites.They are attached to the intestines with hooks and suction cups.

Beef tapeworm is the type of tapeworm that causes taeniahrynchosis.It has a small head with 4 suction cups and 6 hooks, the ribbon body consists of 1000 segments, up to 20 m long.Parasites are helminths, infection occurs through beef, where its larvae are located.Each segment contains hundreds of thousands of eggs.If left untreated, tapeworms will parasitize humans for up to 20 years.It lives in the small intestine, absorbing nutrients across the entire body surface.Live up to 10 years.

Pork tapeworm is a type of tapeworm that causes tapeworm disease or cysticercosis.reaches 3-8 m and has a double hook rim.Life cycle is 20 to 30 years.It can live in any organ and is found in undercooked pork.This cycle is similar to tapeworm price increases.Segments of this tapeworm can crawl out of the anus, where on the skin surface they break and eggs come out.Parasitic worms in the intestines, causing allergies and gastrointestinal problems.

Broad tapeworms cause diphtheria.The parasitic tree is more than 10 m long, flat and wide.Biological helminths reach humans through freshwater fish or crustaceans.For decades, parasitic worms live in the small intestine, clinging to the intestinal wall.After 25 days, the parasite develops into an adult.They suck blood, causing diarrhea and abdominal pain.

Echinococcus is a biological helminth, a small tapeworm, up to 3-5 mm long.On the head there are 2 hooks and suction cups;The parasite has 4-5 segments.The last one is his reproductive system.In the organs, it forms cysts up to 10 cm long (Finland), which contain eggs and larvae.Cysts destroy surrounding tissue.They can burst, then become infected, or new cysts develop.The ultimate owner is a wolf, the intermediate owner is a human.Infection is through nutrition or after contact with pets.In the intestines, larvae (oncospheres) emerge from eggs and are carried throughout the body by the blood.As a rule, they settle in the parenchyma of the liver and lungs, but also live in the intestines.Cysts can only be removed with surgery.

Liver flukes are liver flukes, cat flukes or Siberian flukes.Causes opisthorchiasis.It has a lanceolate shape, 1-2 cm long and 2 mm wide, with 2 mouth suction cups on its head.People become infected by infected freshwater fish that have eaten snails or crustaceans containing worm eggs.Humans are the main host.The parasite lives in the lumen of the small intestine and bile duct.Life cycle up to 20 years;thousands of parasitic individuals in an organism at the same time.The acute phase of the disease is characterized by upper abdominal pain, fever, nausea, muscle pain, diarrhea, and rash.When this process becomes chronic, symptoms of cholecystitis are noted and they do not disappear even when the worms have been expelled.

Disease progression and symptoms

During the acute phase, symptoms may appear at different times, depending on the incubation period, but usually begin after 2-3 weeks.The most common symptoms: allergic rash, lymphadenopathy, development of local or generalized edema, joint pain and muscle pain.When moving to the lungs, there may be coughing, choking, stool disorders (diarrhea), nausea and vomiting.

In the chronic stage, symptoms depend on the organ where the parasites settle and their number.Key features include:

• frequent itching in the anal area;
• headache;
• dizzy;
• sleep disorders;
• bloating;
• rash and itching;
• exhaustion with increased appetite;
• joint and muscle pain;
• yellowness of the skin;
• Tired.
• Prolonged low-grade fever may occur;
• discomfort in the navel or 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 diagnose, a scrape is taken from the rectum and perianal area, and a stool analysis is performed.In this case, the worms can be seen very clearly under a microscope.Blood tests are done to check eosinophils and protein balance.Can examine sputum, stomach and duodenal contents.

Any type of helminth in humans is prevented by regular personal and public hygiene and adequate heat treatment of meat and fish.Regular veterinary examinations and further treatment for all pets are necessary.