Parasite Examples and Symptoms:

The following are a few examples of parasites that infest humans, and the symptoms they cause. This information was taken from The Department of Health and Human Services Centers for Disease Control and Prevention website.


Giardiasis (GEE-are-DYE-uh-sis) is a diarrheal illness caused by a one-celled, microscopic parasite, Giardia intestinalis (also known as Giardia lamblia) and causes over 2 million infections yearly in United States. Once an animal or person has been infected with Giardia intestinalis, the parasite lives in the intestine and is passed in the stool. Because the parasite is protected by an outer shell, it can survive outside the body and in the environment for long periods of time.
During the past 2 decades, Giardiainfection has become recognized as one of the most common causes of waterborne disease (found in both drinking and recreational water) in humans in the United States . Giardia are found worldwide and within every region of the United States.

How do you get giardiasis and how is it spread?
The Giardia parasite lives in the intestine of infected humans or animals. Millions of germs can be released in a bowel movement from an infected human or animal. Giardia is found in soil, food, water, or surfaces that have been contaminated with the feces from infected humans or animals. You can become infected after accidentally swallowing the parasite; you cannot become infected through contact with blood. Giardia can be spread by:

  1. Accidentally putting something into your mouth or swallowing something that has come into contact with feces of a person or animal infected with Giardia.
  2. Swallowing recreational water contaminated with Giardia. Recreational water includes water in swimming pools, hot tubs, jacuzzis, fountains, lakes, rivers, springs, ponds, or streams that can be contaminated with sewage or feces from humans or animals.
  3. Eating uncooked food contaminated with Giardia.
  4. Accidentally swallowing Giardia picked up from surfaces (such as bathroom fixtures, changing tables, diaper pails, or toys) contaminated with feces from an infected person.

What are the symptoms of giardiasis?
Giardia infection can cause a variety of intestinal symptoms, which include

  1. Gas or flatulence
  2. Diarrhea
  3. Greasy stools that tend to float
  4. Stomach cramps
  5. Upset stomach or nausea.
    These symptoms may lead to weight loss and dehydration. Some people with giardiasis have no symptoms at all.

Toxoplasma gondii

Toxoplasma gondii is a singe cell parasite that causes a disease known as toxoplasmosis. While the parasite is found throughout the world, more than 60 million people in the United States may be infected with the Toxoplasma parasite. Of those who are infected, very few have symptoms because a healthy person's immune system usually keeps the parasite from causing illness. However, pregnant women and individuals who have compromised immune systems should be cautious; for them, a Toxoplasma infection could cause serious health problems.

How do people get toxoplasmosis?
A Toxoplasma infection occurs by

  1. Eating undercooked, contaminated meat (especially pork, lamb, and venison).
  2. Accidental ingestion of undercooked, contaminated meat after handling it an not washing hands thoroughly (Toxoplasma cannot be absorbed through intact skin).
  3. Eating food that was contaminated by knives, utensils, cutting boards and other foods that have had contact with raw, contaminated meat.
  4. Drinking water contaminated with Toxoplasma gondii.
  5. Accidentally swallowing the parasite through contact with cat feces that contain Toxoplasma. This might happen by cleaning a cat's litter box when the cat has shed Toxoplasma in its feces touching or ingesting anything that has come into contact with cat feces that contain Toxoplasma accidentally ingesting contaminated soil (e.g., not washing hands after gardening or eating unwashed fruits or vegetables from a garden)
  6. Mother-to-child (congenital) transmission.
  7. Receiving an infected organ transplant or infected blood via transfusion, though this is rare.
What are the symptoms of toxoplasmosis?
Symptoms of the infection vary. Most people who become infected with Toxoplasma gondii are not aware of it.
  1. Some people who have toxoplasmosis may feel as if they have the "flu" with swollen lymph glands or muscle aches and pains that last for a month or more.
  2. Severe toxoplasmosis, causing damage to the brain, eyes, or other organs, can develop from an acute Toxoplasma infection or one that had occurred earlier in life and is now reactivated. Severe cases are more likely in individuals who have weak immune systems, though occasionally, even persons with healthy immune systems may experience eye damage from toxoplasmosis.
  3. Symptoms of ocular toxoplasmosis can include reduced vision, blurred vision, pain (often with bright light), redness of the eye, and sometimes tearing. Ophthalmologists sometimes prescribe medicine to treat active disease. Whether or not medication is recommended depends on the size of the eye lesion, the location, and the characteristics of the lesion (acute active, versus chronic not progressing). An ophthalmologist may provide the best care for ocular toxoplasmosis.
  4. Most infants who are infected while still in the womb have no symptoms at birth, but they may develop symptoms later in life. A small percentage of infected newborns have serious eye or brain damage at birth.


Tapeworm. The dwarf tapeworm or Hymenolepis nana is the most common tapeworm infection diagnosed in the in the United States and throughout the world. Infection is diagnosed in children, in persons living in institutional settings, and in people who live in areas where sanitation and personal hygiene is inadequate.

How did I get infected?
1. One can get infected by accidentally ingesting tapeworm eggs. This can happen by ingesting fecally contaminated foods and water, by touching your mouth with contaminated fingers, or by ingesting contaminated soil.
Adult tapeworms are very small in comparison with other tapeworms and may reach 15-40 mm (up to 2 inches) in length. The adult tapeworm is made up of many small segments, called proglottids (pro-GLOT-ids). As the tapeworm matures inside the intestines, these segments break off and pass into the stool. An adult tapeworm can live for 4-6 weeks. However, once you are infected, the dwarf tapeworm may cause auto infection (the tapeworm may reproduce inside the body) and continue the infection.

What are the symptoms of a tapeworm infection?
Most people who are infected do not have any symptoms. Those who have symptoms may experience nausea, weakness, loss of appetite, diarrhea, and abdominal pain. Young children, especially those with a heavy infection, may develop a headache, itchy bottom, or have difficulty sleeping. Sometimes infection is misdiagnosed as a pinworm infection.
Contrary to popular belief, a tapeworm infection does not generally cause weight loss. You cannot feel the tapeworm inside your body.


Roundworm. Baylisascaris, an intestinal raccoon roundworm, can infect a variety of other animals, including humans. The worms develop to maturity in the raccoon intestine, where they produce millions of eggs that are passed in the feces. Released eggs take 2-4 weeks to become infective to other animals and humans. The eggs are resistant to most environmental conditions and with adequate moisture, can survive for years.

How do humans become infected?
People become infected when they accidentally ingest infective eggs in soil, water, or on objects that have been contaminated with raccoon feces. When humans ingest these eggs, they hatch into larvae in the person's intestine and travel throughout the body, affecting the organs and muscles.

Who is at risk for infection?
Anyone who is exposed to environments where raccoons live is potentially at risk. Young children or developmentally disabled persons are at highest risk for infection when they spend time outdoors and may put contaminated fingers, soil, or objects into their mouths. Hunters, trappers, taxidermists, and wildlife handlers may also be at increased risk if they have contact with raccoons or raccoon habitats.

How common is Baylisascaris infection in raccoons?
Fairly common. Infected raccoons have been found throughout the United States, mainly in the Midwest, Northeast, middle Atlantic, and West coast. Infection rarely causes symptoms in raccoons. Predator animals, including dogs, may also become infected by eating a smaller animal that has been infected with Baylisascaris.

How common is Baylisascaris infection in humans?
Infection is rarely diagnosed. Fever than 25 cases have been diagnosed and reported in the United States as of 2003. However, it is believed that cases are mistakenly diagnosed as other infections or go undiagnosed. Cases have been reported in Oregon, California, Minnesota, Illinois, Michigan, New York, and Pennsylvania. Five of the infected persons died.

What are the symptoms of Baylisascaris infection in humans?
Symptoms of infection depend on how many eggs are ingested and where in the body the larvae migrate (travel to). Once inside the body, eggs hatch into larvae and cause disease when they travel through the liver, brain, spinal cord, or other organs. Ingesting a few eggs may cause few or no symptoms, while ingesting large numbers of eggs may lead to serious symptoms. Symptoms of infection may take a week or so to develop.

Symptoms include:
  1. Nausea
  2. Tiredness
  3. Liver enlargement
  4. Loss of coordination
  5. Lack of attention to people and surroundings
  6. Loss of muscle control
  7. Coma
  8. Blindness

Other animals (except raccoons) infected with Baylisascaris can develop similar symptoms, or may die as a result of infection.


Dr.Clark Consults with OneLifeUSA

     Back in 1995, OneLife was asked by one of our customers if we manufacturer and carry Dr. Hulda Clark's parasite cleanse kit. Our first response: 'No thank you.' And to be honest, after we read some of her research and portions of her book, "The Cure for All Cancers", we thought she sounded like a quack.
     Our customer (let's call him Mr. Smith) did not back down. His wife had cancer and after being told by her doctors that there was nothing more they could do for her, he sought treatment in California with Dr. Clark. Under Dr. Clark's care, Mrs. Smith's condition improved.
     Unfortunately, after being constantly hounded by the FDA, Dr. Clark decided to move her practices over the border into Mexico. Mr. Smith was not interested in taking weekly journeys to Mexico to pick up the herbal formulas Dr. Clark had been preparing for his wife... nor was he about to make them himself in his kitchen.
     After learning about the improved condition of Mrs. Smith and talking to several of other Dr. Clark's patient's we thought, maybe, just maybe, even though it sounds kind of wacky, this Dr. is onto something. The ingredients in her parasite kit had no harmful side effects, so if it could help people and make Mr. Smith happy - there didn't seem to be a downside> especially since Mr. Smith agreed to pay for the entire first batch.
     To make these products in a commercial lab and still adhere to Dr. Clark's "hand made" standards > required input from Dr. Clark herself. Mr. Smith convinced Dr. Clark to work with our chemists and formulators so that her products would be manufactured to meet her strict requirements. In return, we agreed to carry her book, "The Cure for All Cancers". Dr. Clark's main objective was to educated people on parasite infestation and how they could protect themselves; her books provide her educational message.



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