Schistosomiasis is a chronic, debilitating parasitic infection caused by blood flukes of the genus Schistosoma. Often referred to as bilharzia, it ranks among the most devastating tropical diseases in terms of public health impact. Millions of people suffer from the infection globally, with the highest burden concentrated in sub-Saharan Africa. In Nigeria, the disease is endemic in many rural and peri-urban communities, particularly where access to safe drinking water and adequate sanitation is lacking. School-aged children and occupational workers, such as fishermen and irrigation farmers, bear the heaviest burden of disease due to frequent water contact.
The life cycle of the Schistosoma parasite involves two hosts: a definitive human host and an intermediate freshwater snail host.
Transmission in Nigeria is closely tied to water resource development, agricultural practices, and socio-economic conditions. Major rivers, dams, and irrigation schemes create ideal habitats for intermediate snail vectors. Human behaviors—such as swimming in slow-moving streams, washing clothes in rivers, and defecating or urinating near water sources—perpetuate the life cycle.
Communities lacking piped water systems are forced to rely directly on natural water bodies for daily survival. Occupational exposure is equally critical; rice farmers and inland fishermen have prolonged, repeated contact with contaminated water, leading to high worm burdens and severe pathology over time.
Clinical signs vary depending on the invading species and the stage of infection.
Accurate diagnosis confirms the presence of parasite eggs or circulating antigens. Parasitological examination remains the field standard. Urine filtration techniques detect *S. haematobium* eggs, ideally collected around midday when egg excretion peaks. Stool microscopy using the Kato-Katz thick smear technique identifies *S. mansoni* or *S. japonicum* eggs. Dipstick tests for microhematuria serve as a rapid, cost-effective screening tool in high-prevalence Nigerian primary schools. Serological antibody tests are useful for travelers, but they cannot distinguish between past and active infections in endemic populations.
The cornerstone of medical treatment is Praziquantel, a safe and effective oral antischistosomal drug that kills adult worms. Nurses play a vital role in patient preparation, drug administration, and follow-up care. During mass administration campaigns, nurses ensure accurate dosage calculation based on height-for-age poles rather than weighing scales, which speeds up distribution.
Nurses must monitor clients for mild, transient side effects like abdominal discomfort, dizziness, or headache, which actually indicate the drug is working against the dying worms. Patient counseling focuses on adherence to the full dose and emphasizing that treatment cures existing worms but does not prevent reinfection upon subsequent water exposure.
Neglecting schistosomiasis leads to severe, irreversible organ damage. Urinary tract involvement can progress to ureteric obstruction, hydronephrosis, and chronic kidney disease. Severe bladder calcification significantly increases the risk of squamous cell carcinoma of the bladder. Intestinal disease can cause hepatic fibrosis, portal hypertension, esophageal varices, and life-threatening gastrointestinal bleeding. In children, chronic infection contributes to anemia, malnutrition, stunting, and impaired cognitive development, which diminishes educational attainment and future economic productivity.
Controlling schistosomiasis requires a multi-sectoral primary health care approach. Mass drug administration (MDA) targeting school-aged children reduces morbidity and transmission intensity across endemic communities. However, sustainable elimination demands complementary interventions. Providing safe, piped borehole water supply reduces dependence on infested streams. Health education campaigns teach communities about safe sanitation practices and discourage urination or defecation near water bodies. Environmental management, such as clearing aquatic weeds and controlled use of molluscicides, can also reduce snail populations.