Health Surveillance in Réunion. Bulletin of June 26, 2025.

Key Points

Chikungunya

  • Viral transmission continues to decline, with viral circulation limited to certain municipalities and no significant impact on healthcare utilization.

Dengue

  • The last confirmed locally acquired case was identified in week 17, and the last imported case in week 23.

Leptospirosis

  • The seasonal resurgence is still ongoing. It is important to consider a diagnosis of leptospirosis to ensure prompt treatment (antibiotic therapy under medical supervision) and limit the risk of severe illness or even death.

Acute Respiratory Infections (ARI)

  • Health indicators for flu-like syndromes are rising, with limited public health impact.

  • Increased circulation of influenza viruses, with concurrent circulation of influenza A (H3N2) and influenza B.

  • Increased circulation of rhinovirus. For bronchiolitis, health indicators remain at baseline levels.

Gastroenteritis

  • Surveillance indicators in primary care and hospitals (all ages combined) are rising, with a low health impact.

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