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Parasitic Roundworms

We have been discussing parasitic worms. Many of these worms impact man, his pets or livestock. Answer questions relating to the specific worms. The Ascarid worms at the right were passed from human intestines. (The image on the right is used by permission from Ohio State University).(click on the highlighted headings)

Pinworms

Pinworm infections.

  1. What percent of the world population has pinworms?
  2. How long does it take for eggs to hatch and mature to adult worms?
  3. What is the most common symptom?
  4. List three behavioral changes often associated with pinworm infestations.

 

Pinworm-life cycle

Life cycle of the pinworm.

  1. How do humans get pinworms?
  2. Where does the female lay her eggs?
  3. Once the eggs are laid, how soon do they become infective?

 

Intestinal roundworm (Ascaris)

Roundworm infestation.

  1. What percent of the world's population is infected with Ascaris lumbricoides?
  2. What can happen if the larvae migrate through the lungs?
  3. Ascaris seems to be sensitive to anesthetics. What has happened to patients in recovery rooms?

 

Ascaris- life cycle.

Ascaris- life cycle

  1. Where does the adult worm usually live?
  2. How many eggs can the female lay per day?
  3. What normally happens to the juveniles in the lungs?

 

Trichinosis

Trichinella spiralis- infection.

  1. How do humans become infected with trichinosis?
  2. Most recent outbreaks of trichinosis have been traced to pork that was not inspected because it was __________.
  3. Hunters may get trichinosis from eating meat from _______.

 

Trichinosis-life cycle.

Trichinosis- life cycle.

  1. Juvenile worms migrate into ______ of the host.
  2. _____ and _____ are infected when they eat meat containing the juvenile stages.
  3. According to the illustration, list 3 animals that may carry Trichinella worms.

 

Author: REED THOMSON - Email reed.thomson@nebo.edu