Carl R. Darnall Army Medical Center - Health Library

Ascariasis

(Roundworm)

Pronounced: ASS-car-EYE-uh-sis

Definition

Ascariasis is an infection that causes problems in the lungs or bowels.

Digestive Tract and Lungs
Digestion tract and Lungs 3D

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Causes  ^

A roundworm parasite causes ascariasis. The roundworm can grow to over 15 inches (40 centimeters) in length. Their eggs hatch in the stomach and the larvae travel to the liver and lungs. This causes a type of pneumonia. They get into the throat during coughing or working their way up. Once swallowed, they grow into adult worms in the stomach. Their eggs leave the body in the stool.

The cycle starts again when a person takes in food or drinks contaminated with stool that has eggs.

Risk Factors  ^

Roundworms are most common in places with poor sanitation or sewage control. The risk of getting sick is highest in Asia and the western Pacific.

Risk is also higher if exposed to tainted soil or water. This can happen with:

  • Children who are preschool age or younger who play in it
  • Eating food grown in or washed in it
  • Drinking the water
  • Eating the soil

Symptoms  ^

Most people not have symptoms. In those that have them, infection may cause:

Lungs:

  • Dry cough
  • Fever
  • Wheezing
  • Breathing problems

Bowels:

  • Belly cramps
  • Vomiting
  • Diarrhea
  • Weight loss

The worms can cause problems in the gallbladder, liver, pancreas, and appendix.

Appendicitis
Inflammed appendix

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Diagnosis  ^

The doctor will ask about your symptoms. You will be asked about your health and travel history. A physical exam may point to roundworms. If needed, you may also have:

  • Stool tests
  • Blood tests
  • Imaging tests:

Treatment  ^

Medicines treat the roundworm parasites. Surgery can treat bowel obstruction.

Prevention  ^

Always wash your hands after using the bathroom.

When you travel to places where ascariasis is common:

  • Use bottled or boiled water.
  • Eat foods that are cooked through and hot.
  • Don’t eat raw fruits or vegetables that don’t have a peel.
RESOURCES:

Centers for Disease Control and Prevention
https://www.cdc.gov

World Health Organization
http://www.who.int

CANADIAN RESOURCES:

Public Health Agency of Canada
https://www.canada.ca

Travel and Tourism—Government of Canada
https://travel.gc.ca

REFERENCES:

Ascariasis. EBSCO DynaMed Plus website. Available at:http://www.dynamed.com/topics/dmp~AN~T116444/Ascariasis. Updated January 16, 2017. Accessed May 25, 2018.

Ascariasis. Merck Manual Professional Version website. Available at: https://www.merckmanuals.com/professional/infectious-diseases/nematodes-roundworms/ascariasis. Updated February 2017. Accessed May 25, 2018.

Parasites—ascariasis. Centers for Disease Control and Prevention website. Available at: https://www.cdc.gov/parasites/ascariasis/. Updated February 15, 2018. Accessed May 25, 2018.

Last reviewed May 2018 by David L. Horn, MD, FACP  Last Updated: 5/25/2018