Mystery Illness Strikes Half of Belgian School as Cause Remains Unknown

More than half the students at a communal school in Buzet, a village in the municipality of Floreffe, Namur Province, have fallen ill with gastrointestinal symptoms in an outbreak that has baffled health authorities. Approximately 100 of the school’s 194 students have reported vomiting, diarrhea, abdominal pain, and nausea since Wednesday, June 10, according to RTBF. The school was closed on Friday for disinfection and is scheduled to reopen on Monday, June 15.

A Rapidly Escalating Health Crisis

The outbreak began on the afternoon of Wednesday, June 10, when the first students started experiencing symptoms. By Thursday morning, school director Géraldine Pirard noticed an abnormally high number of absences. “We were first surprised by the abnormally high number of absences on Thursday morning,” Pirard told L’Avenir. “Other children then fell ill during the day. I immediately notified our organizing authority, the Commune of Floreffe. A crisis cell was set up.”

By Friday, approximately 80 students were affected. That number climbed to nearly 100 by Saturday. Mayor Philippe Vautard confirmed the scale of the outbreak, stating that roughly half of the school’s students had been affected. No hospitalizations have been reported, and all affected children are recovering or have recovered.

Water Contamination Ruled Out

Initial suspicions focused on the school’s tap water, as all symptomatic children had consumed it. The Société Wallonne des Eaux (SWDE) conducted immediate bacteriological and hydrocarbon tests. In a statement reported by RTBF, the SWDE said: “The water distributed by SWDE complies with current potability standards. No element allows establishing a link between the distributed water and the symptoms reported by students.”

Further testing is ongoing, but the negative results have eliminated water contamination as the primary cause, deepening the mystery surrounding the outbreak.

Shifting Hypotheses: Soil Contamination and Viral Origins

With water ruled out, investigators have turned to alternative explanations. Mayor Vautard noted that experts are examining whether recent excavation work on potentially contaminated soil near the school could be responsible. Weather conditions, including heavy rainfall, may have facilitated runoff toward water infrastructure, though this hypothesis remains unverified.

According to La Libre, the Walloon agency AViQ has recommended collecting vomitus samples from symptomatic children to test for a viral origin. This testing could provide crucial answers about whether a contagious agent is responsible.

Disinfection and Precautionary Measures

The municipality has taken extensive precautionary measures. The Val de Sambre emergency zone conducted a deep disinfection of the entire school premises over the weekend using specialized equipment and products. As a precaution, the water distribution network was purged to ensure optimal water quality before reopening.

SWDE provided bottled water to the school, and posters advising against tap water consumption were displayed in restrooms. Daycare services were maintained for asymptomatic children during the closure.

Notably, doctors in the region reported no similar cases outside the school, suggesting the outbreak was confined to the school environment. The school building itself is only five years old, ruling out aging plumbing as a contributing factor.

What Remains Unknown

Despite the extensive investigation, the exact cause of the outbreak remains an enigma. The key unanswered questions include:

• Why only children? If the cause were environmental, why were no adults or nearby residents affected?
• What was the nature of the soil decontamination work? What contaminants were being removed, and what safety protocols were in place?
• Will a viral cause be confirmed? The AViQ-recommended vomitus testing may provide definitive answers.

Looking Ahead

The school is scheduled to reopen on Monday, June 15, with both primary and nursery sections operating normally. The municipality continues to monitor the situation closely. Further water analysis results are pending, and the results of vomitus sampling could determine whether a viral agent was responsible.

As 7sur7 reported, the commune has assured parents that all necessary measures have been taken to ensure the safety of students upon their return. The case serves as a reminder of the complex challenges facing local authorities when investigating unusual public health events in small communities.