Across the country, flu cases are surging earlier than usual, with more than 800 laboratory-confirmed infections reported last week.
Health authorities say detections have jumped by two-thirds in just seven days, and pharmacies are seeing strong demand for cough and combination medicines.
Officials stress that vaccination and basic hygiene remain the most effective protection.
Wastewater data confirms the rise, with Ticino, Valais, and Basel-City currently the most affected regions.
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