What are the most common Influenza B symptoms now in Japan?

People report sudden fever, sore throat, dry cough, headache, chills, and muscle aches. Fatigue can last several days. Some children have nausea or stomach pain. Seek care quickly for high fever, breathing trouble, confusion, or if symptoms worsen after two days, especially for infants, seniors, or those with chronic conditions.

Are schools in Japan closing due to influenza this month?

Yes, several areas report temporary class or grade closures as absences rise. Aichi recorded a season‑high in classroom closures in the week to February 8, with over 80% of recent patients under 20. Local boards decide closures, so timing and scope differ by city and school district.

How can investors gauge OTC flu medicine demand in real time?

Watch weekend pharmacy traffic, inventory notices in retailer apps, and ranking changes for symptom‑relief products online. Rising mask and home test kit sales often coincide with stronger OTC baskets. Also track clinic wait times and school absence updates, which tend to lead drugstore demand by several days during peaks.

Do masks still help against Influenza B spread?

Yes. Well‑fitted non‑woven masks reduce droplet and aerosol exposure in crowded indoor settings and on public transport. They also lower transmission at home when used early after symptom onset. Combine masking with hand hygiene, ventilation, and staying home when sick to cut risk for families, classrooms, and workplaces.

Law and Government

Japan Flu B Surge February 11: Drugstores, Masks See Demand Spike

ByDanny Kontos February 11, 2026February 11, 2026

Influenza B symptoms are driving a sharp Japan influenza surge in mid‑February. National surveillance shows 22 prefectures at warning levels, while some regions report B accounting for most positives. Aichi has hit a season‑high in classroom closures. We see near‑term upside for drugstores, OTC flu medicine demand, masks, and vaccine appointments. We also flag softer foot traffic risks from staff illness and school interruptions. Below, we summarize public alerts, Influenza B symptoms, and the practical signals investors should track this month.