This article discusses the symptoms, causes, and complications of ascariasis as well as how to treat and prevent it.
Ascariasis Symptoms
Ascaris lumbricoides is a roundworm that can cause a parasitic infection in the intestine. The disease process and associated symptoms are called ascariasis.
Often, people do not have any symptoms. When symptoms do occur, it generally means the person is infected with a large number of worms.
Millions of people worldwide are infected with the parasite, but it is uncommon in the U.S.
Symptoms of ascariasis are often not very severe and include:
Abdominal discomfort Loss of appetite Nausea or vomiting Diarrhea Weight loss Transient respiratory symptoms (as the immature worms migrate through the body to the lungs)
Ascariasis Causes
People become infected with Ascaris lumbricoides by accidentally ingesting eggs found in human feces.
When a person with the infection defecates outside, the eggs are deposited in the soil. The worm eggs live in the ground in places that do not have access to proper sanitation and where people do not practice good hygiene. A person can ingest the worm eggs if:
Their hands or fingers touch the dirtThey eat unwashed fruits or vegetables that grow in the contaminated soilThey drink contaminated water
After a person has ingested worm eggs, they hatch, and the larvae mature in a few days. Then, they migrate throughout the rest of the intestine. Sometimes, they migrate outside the intestine and go to other organ systems like the liver, heart, and lungs.
When the worm larvae are in the lungs, people can experience mild respiratory symptoms such as:
Coughing Shortness of breath Coughing blood
These respiratory symptoms are usually mild and short-lived.
While coughing, small worms are swallowed back into the intestine, where they grow to become adult worms. The cycle then continues with worms laying eggs in the intestine, which are then excreted into areas where the eggs can be transmitted to another person.
Parasitic infections like ascariasis decreased significantly in the United States by introducing modern sanitation and waste treatment. However, the infection still occurs among people who travel to areas with high disease rates and lack of sanitation.
Ascariasis Treatment
Several antiparasitic agents are effective against ascariasis. However, taking these medications does not prevent reinfection and, according to several studies, reinfection with the parasite happens quickly after treatment. This is why it’s essential to practice proper hygiene and environmental sanitation.
The drugs of choice to treat ascariasis include:
AlbendazoleMebendazole
These drugs are very effective with very few side effects. They only need to be taken for one to three days. In fact, a single dose of albendazole is frequently effective in curing ascariasis.
Ivermectin is an alternative treatment option recommended by the CDC.
Prevention
The most effective way to reduce the transmission of Ascaris lumbricoides is to implement adequate sanitation and clean water systems.
In places where people are without such systems, it’s vital to:
Not defecate outdoorsWash hands with clean soap and waterWash and peel fruits and vegetables
Finally, mass pharmacologic treatment with medications for people at risk for ascariasis or who live in areas with high infection rates can reduce the overall spread of the disease and reinfection after treatment.
Complications
It takes several weeks for adult worms to grow to the point that they can be visible in the stool. It is during this later stage of the disease that complications can develop.
The most common complication is a heavy load of parasites that obstructs the intestine. Sometimes, the obstruction can specifically affect the appendix leading to appendicitis.
The worms can also migrate to other organ systems and lead to inflammation of the liver, pancreas, and gallbladder. The diseases that people can develop include:
Cholangitis Acalculous cholecystitis Biliary colic Hepatic abscess Acute pancreatitis
Ascariasis in children is also associated with malnutrition, slow growth, and impaired thinking and verbal abilities. When children have many parasites in the intestine, absorption of proper vitamins and nutrients cannot happen.
Parasitic infections like ascariasis are a common cause of growth impairment and low red blood cell counts in children.
Summary
Ascariasis is a parasitic infection of the intestines that affects millions worldwide. It is caused by a parasite called Ascaris lumbricoides that is found in the soil. The organism is transmitted from one person to another by ingesting contaminated food and water.
Most people don’t have any symptoms, but the worms can lead to complications such as small bowel obstruction. Treatment involves antiparasitic agents such as albendazole. The best way to prevent the illness is by implementing effective sanitation and clean water systems and encouraging proper hygiene.
A Word From Verywell
Millions of people are infected with Ascaris lumbricoides. Still, it is not as common in places with clean water and sanitation. If you live or have traveled to an area without proper sanitation and see worms in your stool, consider ascariasis. Fortunately, it is easily treated.
