Ascariasis

Ascariasis is an intestinal infection caused by Ascaris lumbricoides, a parasitic roundworm that can grow up to 12 inches long. You get it by swallowing microscopic Ascaris eggs found in contaminated soil, food, or water. Poor sanitation and inadequate handwashing are the main ways the infection spreads. Children who play in dirt and put their hands in their mouths are particularly at risk.

Many people have no early symptoms, especially with light infections. When symptoms do appear, the first signs often include coughing and chest discomfort as larvae migrate through the lungs. This respiratory phase typically occurs 4 to 16 days after swallowing eggs. Later, as adult worms settle in the intestines, abdominal pain, nausea, and changes in bowel movements may develop.

Blood tests can provide clues about ascariasis by measuring eosinophil levels, a type of white blood cell that increases during parasitic infections. Eosinophils often rise significantly when larvae migrate through the lungs. However, the definitive diagnosis requires a stool test called an ova and parasites examination. This test identifies Ascaris eggs under a microscope.

Without treatment, adult Ascaris worms can live in the intestines for 1 to 2 years. During this time, female worms produce thousands of eggs daily that pass in stool and contaminate the environment. The infection will eventually clear on its own when the worms die, but this leaves you vulnerable to complications. Treatment with antiparasitic medication clears the infection much faster and prevents serious problems.

Ascariasis is not directly contagious through casual contact like touching or breathing near an infected person. The infection requires swallowing Ascaris eggs that have matured in soil for 2 to 3 weeks. However, poor hygiene can spread eggs from an infected person's hands to surfaces, food, or water. This indirect transmission makes household members at risk if handwashing and sanitation are poor.

If you have ascariasis, focus on foods that are easy to digest while your intestines heal. There are no specific foods you must avoid during treatment. However, preventing reinfection requires washing all raw fruits and vegetables thoroughly before eating. Avoid eating raw or undercooked foods in areas with poor sanitation. Drinking only treated or boiled water also helps prevent reinfection.

Yes, heavy ascariasis infections can cause serious problems, especially in children. A large number of worms can block the intestines, causing severe pain and requiring emergency surgery. Worms may also block the bile duct or pancreatic duct, causing inflammation. Children with chronic infections often experience malnutrition, stunted growth, and impaired cognitive development. Early treatment prevents these serious outcomes.

Antiparasitic medications like albendazole and mebendazole are very effective, clearing ascariasis in over 95% of cases. Treatment usually requires just a single dose or 3 days of medication. The worms die and pass out of the body in stool within a few days. Follow-up stool testing after 3 months confirms the infection is gone and helps detect any reinfection early.

Ascariasis is most common in tropical and subtropical regions with poor sanitation and limited access to clean water. Areas in Africa, Asia, and Latin America have the highest infection rates. Rural communities using human waste as fertilizer face particularly high risk. The infection affects over 800 million people worldwide, making it one of the most common parasitic infections globally.

Prevent ascariasis while traveling by washing your hands thoroughly with soap and water before eating and after using the toilet. Drink only bottled, boiled, or treated water in areas with poor sanitation. Avoid raw vegetables and fruits unless you can peel them yourself. Eat only well-cooked food served hot. These simple precautions significantly reduce your risk of infection in high-risk areas.