🪱 Ascaris lumbricoides
Ascaris lumbricoides is a large parasitic roundworm that infects the human small intestine. It is one of the most common intestinal worms worldwide and is a major cause of ascariasis, especially in areas with poor sanitation.
🔬 Classification
- Kingdom: Animalia
- Phylum: Nematoda
- Class: Chromadorea
- Order: Ascaridida
- Family: Ascarididae
- Genus: Ascaris
- Species: A. lumbricoides
🧬 Morphology
- Shape: Cylindrical, smooth, unsegmented
- Color: Pinkish-white
- Size:
- Females: 20–35 cm long, 3–6 mm thick
- Males: 15–30 cm long, 2–4 mm thick
🔄 Life Cycle
- Egg stage: Fertilized eggs passed in feces contaminate soil.
- Ingestion: Humans ingest eggs through contaminated food, water, or hands.
- Larval migration: Eggs hatch in the small intestine → larvae penetrate intestinal wall → travel via bloodstream to lungs.
- Respiratory stage: Larvae mature in lungs → ascend trachea → swallowed back into the small intestine.
- Adult stage: Worms mature in the intestine → produce eggs → cycle repeats.
⚠️ Transmission
- Fecal-oral route (ingestion of contaminated food, water, or soil)
- Poor sanitation and hygiene increase infection risk
🩺 Symptoms (Ascariasis)
- Mild or asymptomatic in low infections
- Abdominal pain, bloating, nausea
- Intestinal obstruction in severe cases
- Cough, wheezing, or shortness of breath during larval lung migration
- Growth retardation and malnutrition in children
🧪 Diagnosis
- Detection of eggs in stool samples under a microscope
- Occasionally, adult worms may be passed in stool or vomit
💊 Treatment
- Anthelmintic medications:
- Albendazole
- Mebendazole
- Ivermectin (in certain cases)
- Good hygiene and sanitation to prevent reinfection
🧹 Prevention
- Wash hands thoroughly before eating or preparing food
- Wash and cook fruits and vegetables properly
- Drink safe, clean water
- Sanitation improvements and regular deworming programs in endemic areas
I can also make a diagram showing the full life cycle of Ascaris lumbricoides from egg to adult to help visualize the infection process.
Do you want me to create that diagram?
