Health Surveillance in Réunion. Bulletin of July 18, 2025.

Key Points

Chikungunya

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

Dengue

  • Last confirmed indigenous case identified in week 17 and last imported case in week 24.

Leptospirosis

  • End of the seasonal surge. However, leptospirosis is present year-round in the region, and cases also occur during the southern winter.

Acute respiratory infections (influenza, bronchiolitis, COVID-19)

  • Given the rise in health and virological indicators over the past three weeks, Réunion is entering an influenza epidemic phase.

  • Health indicators related to bronchiolitis remain at their baseline levels.

Acute gastroenteritis

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

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