Worm infestations, commonly known as helminthiases, are parasitic infections caused by various worms that affect millions globally, particularly in tropical regions like Ghana. These infections, including soil-transmitted helminths and others, can lead to malnutrition, anemia, and developmental delays, especially in children. The World Health Organization (WHO) emphasizes preventive measures and targeted treatment to control these widespread issues [WHO, 2021].
🪱 Overview and Pathophysiology
Worms enter the body through ingestion, skin penetration, or insect bites, residing in the intestines, blood, or tissues, causing damage by feeding on nutrients or triggering immune responses.
Common Types
- Soil-Transmitted Helminths (STH): Ascaris lumbricoides (roundworm), Trichuris trichiura (whipworm), Necator americanus, and Ancylostoma duodenale (hookworms) [WHO, 2021].
- Other Parasites: Schistosoma species (schistosomiasis), Strongyloides stercoralis (threadworm), Taenia solium (pork tapeworm), and Enterobius vermicularis (pinworm).
Transmission Routes
- Ingestion: Contaminated food or water (e.g., Ascaris, Taenia).
- Skin Penetration: Bare feet in contaminated soil (e.g., hookworms).
- Vector-Borne: Insect bites (e.g., filariasis).
- Key Point: Poor sanitation and lack of hygiene amplify spread [WHO, 2021].
🔍 Clinical Presentation
Symptoms vary by worm type and infection intensity, often subtle in early stages.
Symptoms
General: Abdominal discomfort, diarrhea, or constipation.
Specific to STH: Fatigue, weight loss, stunted growth in children (Ascaris), itchy anus (pinworm), blood in stool (hookworm).
Signs
Physical: Paleness (anemia from hookworm), swollen belly (Ascaris), visible worms in stool.
Systemic: Malnutrition signs, hepatosplenomegaly (schistosomiasis).
Severe: Neurological issues (neurocysticercosis from Taenia).
- Severe abdominal pain or obstruction.
- Persistent fever or neurological symptoms.
- Significant weight loss or anemia.
🧪 Diagnosis
Identification relies on detecting eggs, larvae, or worms in samples, guided by WHO protocols.
Investigations
First-Line: Stool microscopy (Kato-Katz technique for STH), urine filtration (schistosomiasis) [WHO, 2021].
Blood Tests: Eosinophilia, serology for filariasis.
Imaging: Ultrasound for schistosomiasis-related organ damage.
Specialized: Biopsy or PCR in complex cases.
💊 Treatment
Therapy targets worm elimination and symptom relief, aligned with WHO guidelines.
Non-Pharmacological
Improve hygiene (handwashing, safe water), wear shoes in endemic areas, and deworm pets. Promote nutritional support to recover from losses [WHO, 2021].
Soil-Transmitted Helminths
- Albendazole: 400 mg single dose (children ≥2 years, adults) [WHO, 2021].
- Mebendazole: 500 mg single dose or 100 mg twice daily for 3 days.
Schistosomiasis
- Praziquantel: 40 mg/kg single dose (or 20 mg/kg twice daily), repeat if heavy infection [WHO, 2021].
Filariasis
- Diethylcarbamazine (DEC): 6 mg/kg daily for 12 days, with albendazole 400 mg single dose [WHO, 2021].
- Ivermectin: 150-200 µg/kg single dose (in combination).
Pinworm
- Mebendazole: 100 mg single dose, repeat after 2 weeks.
- Treat all household contacts for pinworm to prevent reinfection.
- Avoid DEC in onchocerciasis areas due to Mazzotti reaction.
- Monitor for side effects like abdominal pain or dizziness [WHO, 2021].
🤰 Special Populations
Adjust treatment considering vulnerability:
Children
Use pediatric doses; focus on growth monitoring post-treatment [WHO, 2021].
Pregnancy
Delay treatment until after first trimester unless severe; prefer albendazole or mebendazole in later stages with medical advice.
🚨 Referral Criteria
- Severe complications (e.g., intestinal obstruction, neurocysticercosis).
- Persistent symptoms despite treatment.
- Massive worm burden requiring surgery.
Refer to specialized care facilities.
🧠 Key Takeaways
- ✅ Identify: Stool/urine tests per WHO guidelines [WHO, 2021].
- ✅ Treat: Albendazole for STH, praziquantel for schistosomiasis.
- ✅ Prevent: Hygiene, shoes, and deworming programs [WHO, 2021].
- ✅ Monitor: Anemia and growth in children.
- ✅ Special Care: Adjust for pregnancy and kids.
- ✅ Refer: For severe cases or complications.