Reunion’s emergency departments recorded a 49 percent surge in influenza-like illness visits in a single week, the clearest operational signal yet that the island has crossed into epidemic territory. Sante Publique France made the declaration official on Friday, September 4, 2026, activating epidemic-phase protocols across the health system.
The classification rested on three concrete surveillance thresholds. Epidemic indicators exceeded baseline levels across two consecutive weeks. Emergency department visits for influenza-like illness climbed for three consecutive weeks. Sentinel physician networks reported continuous increases in acute respiratory infection consultations across the same period. All three conditions met simultaneously, triggering the formal transition.
The emergency department picture is striking but not yet alarming. Children under 15 accounted for 74 percent of influenza-related presentations, a demographic group that typically does not carry high risk for severe disease outcomes. That pediatric skew matters for how services are configured and where demand concentrates.
Hospitalization numbers moved upward but remained modest. Admissions rose to 10 in week 35, up from 8 in week 34. That moderate progression, combined with the pediatric composition of emergency visits, suggests inpatient capacity is not yet under significant strain.
Meanwhile, primary care infrastructure is absorbing growing pressure. The proportion of acute respiratory infection consultations in sentinel physician networks rose to 5.3 percent in week 35, up from 4.6 percent the prior week. That figure now sits above the historical average recorded between 2013 and 2025, meaning community physicians are handling respiratory illness volumes that exceed what they typically see during comparable periods over the past dozen years.
Three influenza strains are circulating across the island. A(H1N1)pdm09 dominates, with A(H3N2) and type B strains also present. Rhinovirus activity intensified sharply alongside influenza: the positivity rate jumped to 15 percent from 6 percent the previous week, adding a second respiratory pathogen to the burden on outpatient services.
The sentinel physician network’s sustained three-week upward trajectory in consultations, taken together with the emergency department surge and rising hospitalizations, formed the evidence base Sante Publique France used to formalize the epidemic declaration. The infrastructure response now operates under epidemic protocols.
Current health impact remains limited. The concentration of cases among children, modest hospitalization figures, and the absence of severe disease signals in available data all point to an epidemic in its early stages. Whether the system holds at this level or faces escalating demand depends on how the three circulating influenza strains and the accelerating rhinovirus spread develop over the coming weeks.