Worms:
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Worms: A small, limp less invertebrate with an elongated, soft, and naked body, as a flat worm, roundworm, or annelid.
* Parasitic Worms: many species of worms (also referred to as helminths) are parasitic by nature and select the human organism as their host. Whereas invasion by any form of organism is usually called an infection, the presence of parasitic worms in the body also can be termed and infestation. The microscope is required for the discovery of the eggs or larval forms of most worm infestations.
* Common roundworm: The cost common of the intestinal worms is the large, rounded ascaris (as'kah-ris), which is very prevalent in many parts of Asia, where it is found mostly in the larval form. In the United States it is found especially frequently in the children of the rural South. This worm resembles the earthworm (fish worm) in appearance and may be present in such large numbers that intestinal obstruction ensues. the eggs produced by the adult worms are very resistant so that they can live in soil during either freezing or hot, dry weather and cannot be destroyed even by strong antiseptics. The embryo worms develop within the eggs deposited with excreta in the soil, and later reach the digestive system of a victim by means of contaminated food. Discovery of this condition may be made by a routine stool examination.
* Pinworms: Another fairly common infestation, particularly in children, is the seat or pinworm (Enterobius Vermicularis), which is also very hard to control and eliminate. The worms average somewhat less than one-half inch in length and live in the lower part of the alimentary tract (organs of digestion). The adult female moves outside to the vicinity of the anus to lay its thousands of eggs. These eggs are often transferred by the child's fingers from the itching anal area to the mouth. In the digestive system of the victim the eggs develop to form new adult worms, and thus a new infestation is begun. The child also may infect others by this means. patience and every precaution, with careful attention to the doctor's instructions, are necessary if the patient is to be rid of the worms. * Washing hand, keeping fingernails clean, and avoiding finger sucking are all essential.
* Hookworms: Parasites that live in the small intestine. They are dangerous because they suck blood from the host, causing such a severe anemia (blood deficiency) that the victim becomes sluggish, both physically and mentally. Most victims become susceptible to various chronic infections because of extremely reduced resistance following such a great and continuous blood loss. Hookworms lay thousands of eggs, which are distributed in the soil by contaminated excreta,. The eggs develop into small larvae which are able to penetrate the intact skin of bare feet. They enter the blood, and by way of the circulating fluids, the lungs and the upper respiratory tract, finally reach the digestive system. Prevention of this infestation is accomplished best by the proper disposal of excreta, attention to sanitation, and the wearing of shoes in areas where the soil is contaminated.
* Other roundworms: While most roundworms are transmitted via, excreta, the small Trichinella (trik-i-nel'ah) found in pork and other muscle foods is an exception. These tiny roundworms become enclosed in a cyst, that is, a sac, inside the muscles of the rat, the pig and man. If pork is not well cooked, these sacs or cysts are dissolved by the host's digestive juices, and the tiny worms mature and travel to the muscles where they again become encased. This disease is known a trichinosis (trik-i-no'-sis) . Another threadlike worm causes filariasis (fil-ah-ri'ah-sis). This tiny worms transmitted by such biting insects as flies and mosquitoes. The worms grow in large numbers, causing various body disturbances. If the lymph vessels become clogged by them, there results a condition called elephantiasis (el-e-fan-ti'ah-sis) in which the lower extremities and the scrotum may become tremendously enlarged. Filariasis is most common in tropical and subtropical lands, such a southern Asia and many of the South Pacific islands.
*Flatworms: Some flatworms resemble long ribbons, while other have the shape of a leaf. Tapeworms may grow in the intestinal tract to a length of from 5 to 50 feet. They are spread by infected, improperly cooked meats, including beef, pork and fish. As is the case with most intestinal and worm parasites, the reproductive systems are very highly developed, so that each worm produces an almost unbelievable number of eggs which then may contaminate food, water and soil. The leaf-shape flatworms are known as flukes; they may invade various parts of the body including the blood, the lungs, the liver and the intestine.
Symptoms:
* Severe anal itching, more so at night
* Itching on the soles of the patients feet may suggests hookworms; in some, this may be accompanied by a rash, coughing bloody sputum, and fever, followed by loss of appetite, diarrhea, palpitations, fatigue and anemia.
* Diarrhea and cramping that last up to 7 days, followed by a fever, muscle pain, facial swollen around the eyes and conjunctivitis (pink eye); may be signs of trichinosis.
* Weight loss and loss of appetite, irritability, diarrhea, abdominal pain and vomiting are symptoms of tapeworms.
* Breathing difficulties, coughing and wheezing, followed by vomiting, stomach pain, and bloating, may suggest ascariasis.
* Bronchitis; diarrhea, abdominal pain and flatulence; with small red lesions that may itch, may suggest threadworms.
* Any worm infestation can lead to respiratory or cardiovascular complications, but most are easily treated and cause no lasting harm.
Treatment:
* Responds to medicines specifically for the type of worm: outcome good
* Your doctor may prescribe medication with pyrantel or mebendazole for hookworms and threadworms.
* For pinworms, your doctor may prescribe three oral doses of mebendazole, two weeks apart.
* Since the eggs can easily spread, everyone in the household must be treated. Washing all bed linens and clothing with hot water (with detergent) is essential to eradicate all pinworm eggs.
* To relieve itching in the anal area, try applying petroleum jelly to anal area.
* Trichinosis that spreads to the respiratory, cardiovascular or central nervous system is rare, it is treated with corticosteroids to fight the inflammation.
most cases of trichinosis are mild and do not need medication; but if symptoms are severe, your doctor may prescribe mebendazole.
* Tapeworms may not clear your system for up to five months.
* After you have completed a course of treatment, your doctor may want ot repeat the diagnostic tests to make sure the worms are gone.
***Good hand washing is important. Before and after bathroom use; Before and after dining.
***Keep fingernails short and clean. (keep child from putting fingers into mouth)
***Have all your four-legged pets checked and treated for worms.
***Cook meat thoroughly.
***Wash utensils, that comes in contact with raw meat with hot soapy water.
***Wearing shoes where hookworms and threadworms may live (soil)
***Call your doctor if you have any of the above symptoms
Ascariasis overview
Ascariasis — an in-depth look at causes, treatment and prevention of one particular roundworm infection.
Introduction
Signs and symptoms
Causes
Risk factors
When to seek medical advice
Screening and diagnosis
Complications
Treatment
Prevention
Introduction
Ascariasis is a type of roundworm infection. Roundworms are parasites that use your body as a host to stay alive and reproduce, maturing from eggs to adult worms inside your body. Ascaris eggs are microscopic, but the adult worms are the largest of the intestinal roundworms, reaching lengths up to 40 centimeters, or about 15 inches.
Ascariasis is the most common type of roundworm infection in humans, infecting approximately 25 percent of the world's population. The highest rates of infection occur in developing countries. In the United States, ascariasis is more common in rural areas with warm climates, with a higher infection rate in the South.
Most of the time, ascariasis causes no symptoms, or only mild stomach or digestive problems. But when your body is infested with hundreds of worms, more serious symptoms and complications can occur. The good news is that ascariasis can be treated effectively with medication. There also are simple steps you can take to prevent ascariasis, mostly involving good hygiene and proper sanitation.
Signs and symptoms
Mild ascariasis — with only a few parasites in your body — may cause no symptoms. Symptoms occur with moderate or heavy infestations, sometimes progressing as the parasite migrates through your body. After you ingest ascaris eggs, they hatch in your intestine and the larvae migrate into your lungs. At this stage, you may experience symptoms similar to pneumonia, including:
* Persistent cough
* Shortness of breath
* Wheezing
The ascaris larvae eventually reach your throat, where they are coughed up and then swallowed. They then enter the intestine, where they mature and mate. In mild or moderate ascariasis, the intestinal infestation can cause:
* Vague abdominal pain
* Nausea and vomiting
* Diarrhea or bloody stools
If you have a heavy intestinal infestation — a large number of worms — you may experience:
* Severe abdominal pain
* Fatigue
* Vomiting
* Weight loss
* A worm in vomit or stool
* A worm emerging from nose or mouth
Image of an ascaris worm
Image of an ascaris worm
Causes
About two months after you first get ascariasis, the mature worms begin laying eggs in your intestine. These microscopic eggs travel through your digestive system and eventually can be found in your feces. Eggs require 10 to 14 days in soil at warm temperatures to become capable of infecting a new host, and can remain viable in the soil for up to six years. When the eggs are ingested, the life cycle begins again. Adult worms can live up to two years, and female worms can produce more than 200,000 eggs daily.
The parasite can be transmitted when infected human feces are mixed with soil. In many developing countries human feces are used for fertilizer, or poor sanitary facilities allow human waste to mix with local soil in yards, ditches and fields. The eggs can survive in soil for years to reinfect members of the community. The eggs infect their hosts when humans eat the contaminated vegetables and fruit grown in that soil.
Risk factors
Risk factors for ascariasis include:
* Poor sanitation and the use of human feces as fertilizer. Ascariasis is more widespread in developing countries where human feces are allowed to mix with local soil. There, the eggs become infective and are capable of infecting people who eat produce grown in it or otherwise ingest the eggs.
* Warm climate. Ascaris worms thrive in milder climates. In the United States, ascariasis is more common in the South. But it's more prevalent in developing countries with warm temperatures year-round.
* Heredity. Some studies have suggested that heredity may play an important part in susceptibility to ascariasis.
When to seek medical advice
If you have gastrointestinal problems that won't go away, such as abdominal pain, diarrhea or nausea, consult your doctor.
However, if you have only mild ascariasis, you may never need medical attention. While symptomatic infections usually warrant treatment, infections with no symptoms typically don't need to be treated. In some cases, ascariasis will resolve on its own. This occurs when there are no male worms to mate with females and the females eventually die.
Screening and diagnosis
About two months after you ingest ascaris eggs, the ascaris worms mature and begin laying thousands of eggs a day. These eggs travel through your digestive system and eventually can be found in your stool. To diagnose ascariasis, your doctor will examine your stool for the microscopic ascaris eggs and larvae. In heavy infestations, it's possible to find worms after you cough or vomit, and the worms can come out of other body openings, such as your mouth or nostrils. If you notice anything resembling a worm when you cough or vomit, or if one emerges from your nose or mouth, keep it to let your doctor examine it.
Complications
Complications related to typical ascariasis are rare. However, potentially dangerous complications can develop if you have a heavy infestation.
* Nutritional deficiencies. Children with ascariasis are especially at risk of nutritional deficiencies. Loss of appetite and insufficient absorption of digested foods can occur as a large number of parasites take nourishment from the host's body.
* Intestinal blockage and perforation. In heavy ascariasis infestation, a mass of worms can block a portion of the intestine, causing severe abdominal cramping and vomiting. The blockage can even perforate the intestinal wall or appendix, causing hemorrhage or appendicitis.
* Allergic reactions. Some people develop allergic reactions to the ascaris worm's metabolic excretions and secretions, or to dead and dying worms. These reactions can cause signs and symptoms such as asthma, insomnia, eye pain and rashes.
Treatment
Anti-parasite (antihelminthic) medications are the first line of treatment against ascariasis. The most common are mebendazole (Vermox), albendazole (Albenza) and pyrantel (Antiminth, Pin-Rid). These medications work by killing the adult worms as well as the larvae and eggs to prevent reinfection. You may have mild gastrointestinal side effects during the course of treatment, and you may need to take multiple doses to get rid of the infestation completely.
Surgery
In cases of heavy infestation, surgery may be necessary to repair damage the worms have caused and to remove worms. Intestinal obstruction or perforation, bile duct obstruction and appendicitis are complications that may require surgery.
Prevention
The best defense against ascariasis is good hygiene and common sense. Follow these tips to avoid infection:
* Practice good hygiene. Ascariasis is spread by ingesting parasite eggs from contaminated soil. Before handling food, always wash your hands with soap and water, and wash fresh fruits and vegetables thoroughly.
* Use care when traveling. Ascariasis is the most common roundworm infection in the world, with higher infection rates in developing and warm-climate countries. When traveling, use only bottled water and avoid raw vegetables unless you can peel and wash them yourself. As a rule, eat only foods that are hot and cooked.
2006-08-01 23:26:19
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answer #1
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answered by Wassim4u 2
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