### animal | worm | nematode:

Pinworm
* All pinworms have a conspicuous muscular bulb on the posterior end of the esophagus.
* Most pinworms cause severe irritation
* Most pinworms stay in gastrointestinal tracts
* Some pinworms feed on bacteria
  - sugar
* affect people worldwide of all ages and walks of life.
* also have a direct life cycle and commonly cause an obstruction in the intestinal canal.
* are a common nematode infection in humans
  - parasitic infestation in the United States
  - less common intestinal parasitism of hamsters
  - relatively common problem among children
  - serious problem to school-age children
* are a type of little worm that commonly infects the intestines, often in kids
  - nematode called a roundworm
  - parasite that lives in the digestive system of humans
* are about the length of a staple and live in the rectum of humans
  - actually less damaging to the equine system than any other internal parasite group
  - animals
  - basically commensal, which means they neither harm nor benefit the host
  - big enough to be seen with the naked eye
* are common in school-aged children
  - intestinal parasites in mice
  - contagious, especially in small children
  - easy to get
* are extremely common intestinal parasites
  - common, affecting all ages and people on all social and economic levels
  - harmless and are never present very long without causing some anal itching
  - highly contagious and can spread through a classroom quite quickly
  - microscopic
  - more common in crowded conditions
  - most active at night
  - never around very long before they cause itching
  - one of the most common parasites that infect human guts
  - prolific breeders, with one female able to lay thousands of eggs per day
* are small nematode worms that infect the human intestines and rectum
  - nematodes that live in the colon
  - parasites that can live in the colon and rectum
* are small, thin parasites
  - threadlike roundworms found primarily in the colon and rectum
  - spread from person to person
* are the most common parasitic worm in the United States
  - common, especially among children
  - tiny parasitic worms that live in the large intestine
  - tiny, white, thread-like worms that live in the rectum
  - transmitted to a human host by ingestion of the pinworm eggs
  - usually pointedy on the ends
* are very common in childhood
  - infectious and can cause a lot of itchiness in the anal area
  - visible
  - widely present and increasing on tomato
  - worms that lay eggs around the anus area
* begin their lives in the small intestine.
* can affect both sexes, all ages, but is most common in children of elementary school age
  - also spread from one person to another
  - be hard to see
  - easily penetrate the skin
  - live for as long as two weeks outside the body
  - spread easily between children
* cause irritation.
* cause little damage and can be easily eradicated with proper treatment
  - eradicated easily with proper treatment
  - no harm or discomfort apart from anal itching, and treatment cures most cases
* common intestinal infection which often causes no symptoms.
* enter the body when eggs are swallowed.
* get into the body when people ingest the microscopic pinworm eggs.
* have the most efficient life cycle of all the parasites that infect the horse.
* includes brains
  - cell membranes
  - cells
  - corpi
  - cytoplasm
  - ears
  - faces
  - heads
  - nuclei
  - plasma membranes
  - sections
  - skulls
  - vacuoles
* infect only humans, living in their intestines and are easily transmitted to other people.
* is an intestinal infection caused by tiny parasitic worms
  - spread very easily to others in close contact with the infected person
* is the most common human worm infection in the United States
  - people's lower intestinal tracts
  - much of their life cycle in human intestines
* look like tiny pieces of white thread.
* occasionally cause nausea and vomiting, too.
* only infect humans.
* reappear after treatment.
* take up residence in the large intestine of an infected child.
* thrive on sugar and refined carbohydrates.
* travel from the cecum to the rectum to lay eggs around the anus and buttocks.