what stage of a pig tapeworm does a human have to ingest to become infected

Facts you lot should know about cysticercosis (pork tapeworm infection)

  • Cysticercosis is a parasitic disease caused by ingesting the eggs of the pork tapeworm, Taenia solium.
  • Human tapeworm infection (taeniasis) occurs after ingesting raw or undercooked pork, and cysticercosis occurs after the ingestion of Taenia solium eggs.
  • The symptoms of neurocysticercosis may include
    • headaches,
    • confusion,
    • seizures, and
    • vision changes.
  • Cysticercosis is typically diagnosed based on the patient's symptoms and imaging report results. Blood work is sometimes useful.
  • Cysticercosis may be treated with medications, including anthelmintics, corticosteroids, and anticonvulsants, while some patients may require surgery.
  • Cysticercosis can lead to neurologic and ocular complications, and rarely death.
  • Cysticercosis can exist prevented past educating individuals about proper food handling, good personal hygiene, and improved sanitation.

What is cysticercosis?

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Cysticercosis is a systemic parasitic infestation acquired by ingesting the eggs of the pork tapeworm, Taenia solium. The symptoms of this illness are caused by the development of characteristic cysts (cysticerci) which most often affect the central nervous organization (neurocysticercosis), skeletal musculus, optics, and skin. Many individuals with cysticercosis never experience any symptoms at all (asymptomatic).

The pork tapeworm responsible for causing cysticercosis is endemic to many parts of the developing world, including Latin America, Asia, and sub-Saharan Africa. The World Wellness Organization (WHO) estimates that cysticercosis affects about 50-100 million people worldwide. The incidence of cysticercosis has increased in the United States due to increased immigration from developing countries. Approximately 1,000 new cases of cysticercosis in the United States are reported annually. The bulk of cases in the U.s.a. occur in Latin American immigrants. Neurocysticercosis is a leading cause of adult-onset seizures worldwide, and information technology is estimated to cause 30% of all epilepsy cases in countries where the parasite is owned. The Centers for Disease Control and Prevention (CDC) has designated cysticercosis as ane of five "neglected parasitic infections" in the United States, and the WHO has designated cysticercosis as one of 17 "neglected tropical diseases" worldwide.

Historically, the disease has been recognized since almost 2000 B.C. by the Egyptians, and afterwards it was described in pigs by Aristotle. The disease was besides recognized past Muslim physicians and is thought to be the reason for Islamic dietary prohibition of eating pork. In the 1850s, German investigators described the life cycle of T. solium.

Cysticercosis Symptoms & Signs

The symptoms of cysticercosis are acquired by the development of characteristic cysts (cysticerci) that are well-nigh ofttimes plant in the central nervous system (neurocysticercosis), skeletal muscle, eyes, and peel. Nonetheless, many people with the condition do not feel whatever symptoms at all (asymptomatic). Other associated symptoms and signs for cysticercosis affecting the central nervous system can include

  • seizures,
  • headaches,
  • confusion,
  • lack of attention to people and surroundings,
  • difficulty with balance, and
  • excess fluid around the brain (hydrocephalus).

What causes cysticercosis?

Cysticercosis in humans is caused by the broadcasting in humans of the larval form of the pork tapeworm, Taenia solium, which and so form cysts in various organs. When the eggs of Taenia solium are ingested past humans, the tapeworm eggs hatch and the embryos penetrate the intestinal wall and reach the bloodstream. The germination of cysts in dissimilar torso tissues leads to the development of symptoms, which volition vary depending on the location and number of cysts.

What are risk factors for cysticercosis?

Risk factors associated with acquiring cysticercosis include living in areas where the parasite is endemic (most unremarkably in rural developing countries where pigs roam freely and come into contact with homo carrion), drinking h2o or eating food contaminated with tapeworm eggs, and living in a household where another family member has abdominal tapeworm infection (taeniasis). Individuals who take taeniasis and poor hygiene are as well at increased gamble of infecting themselves.

How does cysticercosis spread?

Humans are the host for Taenia solium, and they may behave the tapeworm in their intestine (taeniasis), frequently without symptoms. The tapeworm eggs are periodically shed in the carrion by the human reservoir, and typically pigs ingest the tapeworm eggs in contaminated nutrient or water. The pigs afterward become infected and develop cysticerci in their body tissue. When humans swallow infected raw or undercooked pork, the life cycle of the tapeworm is complete and the cycle continues.

Human cysticercosis, yet, develops later on humans ingest Taenia solium eggs. The eggs are typically spread via food, h2o, or surfaces contaminated with infected feces. Oftentimes, the eggs may exist spread from the hands of infected food handlers who do non clean their hands or from fruits and vegetables fertilized/irrigated with water containing infected human feces. Though the source of this fecal-oral transmission near frequently occurs from other infected individuals, it is also possible for individuals who deport the tapeworm to infect themselves.

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What is the incubation catamenia for cysticercosis?

The incubation flow for taeniasis (intestinal tapeworm infection) tin vary, and some individuals may be asymptomatic. Some individuals with taeniasis may develop nonspecific symptoms such as abdominal discomfort, nausea, diarrhea, or constipation about 6 to 8 weeks after ingesting pork containing cysticerci, when the tapeworm has get fully adult.

The incubation period for cysticercosis is variable. Many individuals may remain completely asymptomatic, while others may non develop symptoms from cysticercosis until many years later infection.

Is cysticercosis contagious?

Cysticercosis is not contagious. Even so, people who carry the abdominal tapeworm (taeniasis) can shed the tapeworm eggs in their feces, and if they do poor hygiene (not washing their hands after using the bathroom), they can infect others or themselves if the eggs are accidently ingested.

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What are cysticercosis symptoms and signs?

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The symptoms will depend on the location and the number of cysticerci, though many individuals with cysticercosis volition never develop whatsoever symptoms at all. The majority of patients with cysticercosis who present to a health care professional person accept central nervous system involvement (neurocysticercosis or NCC). Symptoms of neurocysticercosis may include the post-obit:

  • Nausea and vomiting, abdominal pain
  • Headache
  • Lethargy
  • Confusion
  • Vision changes
  • Residue problems
  • Weakness or numbness
  • Seizure (oft the presenting symptom, occurs in near seventy% of people with NCC)

Involvement of other body tissues may cause skeletal musculus swelling, subcutaneous cysts, and vision changes from cysts infecting the eyes.

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Cysticercosis (Pork Tapeworm Infection) See pictures of Bacterial Skin Conditions Encounter Images

What specialists treat cysticercosis?

The types of specialists involved in treating individuals with cysticercosis depend on the clinical presentation and the areas of the torso involved. An infectious-illness specialist volition likely be involved. A neurosurgeon may be consulted if surgical management is necessary. A neurologist may care for patients who experience seizures. Finally, an ophthalmologist may be needed in cases of centre involvement.

How do health care professionals diagnose cysticercosis?

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The diagnosis of cysticercosis can sometimes exist hard, as many individuals are asymptomatic, and the diagnosis is only made later on patients have developed symptoms of the illness. Diagnosis may require a combination of tests and imaging studies. In general, however, the patient'southward clinical presentation along with abnormal radiographic imaging results (CT scan of the brain/MRI of the encephalon) lead to the diagnosis of neurocysticercosis. Blood testing can sometimes exist used as an adjunct in making the diagnosis, though it is not always helpful or accurate. These tests are commonly performed in more than specialized labs. Rarely, a biopsy from affected tissue may be needed to brand the diagnosis. Stool studies are sometimes likewise obtained because they may contain identifiable parasite eggs.

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What is the treatment for cysticercosis?

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The handling of cysticercosis depends on various factors, including the individual'due south symptoms, the location and number of cysticerci, and the phase of cyst evolution. Mostly speaking, handling is tailored to each individual patient and their item presentation, and treatment regimens may include anthelmintic agents, corticosteroids, anticonvulsant medications, and/or surgery. Asymptomatic patients may non require whatever treatment at all. Controversy does be as to which patients require treatment with the various medications.

Active taeniasis can be treated with praziquantel (Biltricide) or niclosamide. Praziquantel should be used with caution if there is the possibility of neurocysticercosis, as it can crusade inflammation effectually dying cysts.

For cysticercosis, the most commonly used anthelmintic agents include albendazole (Albenza) and praziquantel. These antiparasitic medications are effective in eliminating viable cysticerci, though they may cause reactive localized inflammation. Consequently, the utilize of these medications must be evaluated on a case-by-case ground. More than ane form of treatment may be necessary to completely eliminate active cysts.

Corticosteroids may also be used in conjunction with, or instead of, antiparasitic medications. However, corticosteroids are used to subtract inflammation only are non active against the parasite. Again, treatment with these medications must be tailored to each individual case. Consultation with an infectious affliction expert is recommended.

Anticonvulsant medications are used in patients with neurocysticercosis experiencing seizures or at high risk for recurrent seizures. Various anticonvulsant medications, such as carbamazepine (Tegretol) or phenytoin (Dilantin), may be prescribed. Consultation with an experienced neurologist may be helpful to determine patient treatment.

Surgical management may also exist necessary in select cases of cysticercosis. Surgical removal of fundamental nervous system cysts or placement of a brain shunt (to relieve force per unit area) is sometimes necessary in some cases of neurocysticercosis. Certain cases of cysticercosis involving the eyes or subcutaneous cysts may besides require surgery (ophthalmic surgeon).

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What are the complications of cysticercosis?

The potential complications of cysticercosis may include the post-obit:

  • Seizure
  • Stroke
  • Vision changes
  • Cerebral problems
  • Death

What is the prognosis of cysticercosis?

The prognosis for the bulk of patients with cysticercosis is splendid with proper medical treatment and management. Many individuals with cysticercosis will never develop whatever symptoms of the disease. Those individuals who develop neurocysticercosis and/or seizures normally have good outcomes if their disease is promptly treated and if the patients comply with medications. Death from cysticercosis is rare, but information technology can occur. From 1990-2002, there were approximately 221 cysticercosis-related deaths in the United States.

Is information technology possible to prevent cysticercosis?

The prevention of cysticercosis can exist accomplished through various measures including the following:

  • Public pedagogy regarding the parasite and its route of transmission
  • Avoidance of raw or undercooked pork in endemic areas to avoid abdominal infection
  • Avoidance of potential fecal-oral routes of manual through routine mitt washing, good personal hygiene, as well as through the proper handling and preparation of foods
  • Meat inspection and the proper disposal of infected meat in endemic areas
  • Improved sanitary measures for human waste disposal in endemic areas
  • Screening contacts of infected individuals and instituting appropriate treatment
  • Developing a vaccine for the prevention of cysticercosis which may be used in the future (Currently, there is no vaccine approved for utilize in humans, though there have been advances in vaccines being used in pigs.)

Medically Reviewed on ane/12/2021

References

Switzerland. World Health Organization. "Taeniasis/Cysticercosis." <http://www.who.int/zoonoses/diseases/taeniasis/en/>.

United States. Centers for Disease Command and Prevention. "Parasites -- Cysticercosis." Sept. 22, 2020. <http://www.cdc.gov/parasites/cysticercosis/>.

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Source: https://www.medicinenet.com/cysticercosis/article.htm

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