Prevalence of Urinary Schistosomiasis among Internally Displaced School-Age Children in Sudan: The Impact of Water Sources and Water-Contact Activities amid Armed Conflict
This cross-sectional study conducted in 2026 among 302 internally displaced school-age children in Sudan reveals a high prevalence (47.4%) of urinary schistosomiasis, which is strongly associated with exposure to canal water and activities such as swimming and fishing amidst the country's ongoing armed conflict.
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In many parts of the world where fresh water is scarce or unsafe, a microscopic parasite called Schistosoma haematobium thrives. This organism lives in specific types of freshwater snails and releases tiny, free-swimming larvae that can penetrate human skin. When people, especially children, come into contact with infested water while swimming, washing, or fishing, these larvae enter the body and mature into adult worms. The adults live in the blood vessels surrounding the bladder, where they lay eggs. Some of these eggs are passed out of the body in urine, but others can get stuck in the bladder wall, causing inflammation, bleeding, and long-term damage to the urinary system. This condition, known as urinary schistosomiasis, is a major health concern in tropical regions, often linked to poverty and a lack of clean water. The situation becomes even more precarious when communities are forced to flee their homes due to war, as the collapse of water systems and healthcare services leaves vulnerable populations exposed to contaminated sources with nowhere to turn for help.
In the midst of the armed conflict that began in Sudan in 2023, a team of researchers set out to understand the scale of this threat among children who had been displaced from their homes. Focusing on a group of school-aged children living in camps near Wadelfadni in Gezira state, the study aimed to see how many were infected and to identify the specific daily activities that were putting them at risk. The researchers worked with 302 children, ranging in age from six to eighteen years, gathering information about their lives, the water they used, and their habits. They collected urine samples from each child and examined them under a microscope to look for the distinctive eggs of the parasite. The goal was not just to count the infections, but to trace the connection between the disease and the harsh realities of life in a displacement camp, where safe water is often unavailable.
The results painted a stark picture of the health crisis facing these children. Nearly half of the group, specifically 47.4 percent, were found to be carrying the infection. This high rate suggests that the transmission of the parasite is active and widespread within these camps. The researchers looked closely at whether age or gender played a role in who got sick, but they found no significant difference between boys and girls, nor between younger and older children. The infection seemed to affect the entire school-age population equally, likely because the water sources themselves were contaminated rather than specific groups being more susceptible. However, a very strong link emerged between the presence of blood in the urine and the infection. Among the children who reported seeing blood in their urine, almost all of them were infected. This symptom, known as hematuria, served as a clear warning sign that the parasite was present, though the researchers noted that many infected children did not show this symptom, meaning the absence of blood does not guarantee safety.
The study also pinpointed exactly where the danger lay in the children's daily routines. The source of the water they used made a massive difference. Children who relied solely on canal water, which is open surface water often used for irrigation, had the highest infection rates. Those who used a mix of canal water and water from deep underground wells, known as boreholes, also faced high risks, while children who used only borehole water were far less likely to be infected. This points to the canal water as a primary breeding ground for the snails that carry the parasite. Beyond the water source, the activities the children engaged in were even more telling. Swimming was the most dangerous activity by far; nearly 90 percent of the children who reported swimming in the water were infected. Fishing also carried a significant risk, with two-thirds of those who fished testing positive. In contrast, routine tasks like washing clothes or using water for domestic chores did not show a statistically significant link to infection, suggesting that the prolonged, full-body exposure of swimming and fishing allows the parasite to enter the body much more easily.
These findings highlight how the disruption caused by conflict has created a perfect storm for disease. When safe water infrastructure is destroyed, people are forced to rely on untreated surface water for everything from drinking to recreation. The study underscores that the solution requires more than just treating the sick; it demands a shift in how these communities access water and interact with it. The researchers concluded that to protect these children, there must be an urgent push to provide safe water, educate families about the risks of swimming in contaminated sources, and implement regular screening and treatment programs. Without these interventions, the cycle of infection is likely to continue, leaving a generation of displaced children vulnerable to a preventable disease that can cause lifelong harm.
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