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Updated:March 27, 2026

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Influenza

What is influenza?

“Influenza” is different from a common cold.

Influenza exhibits severe systemic symptoms including a fever of 38 degrees Celsius or higher, headache, joint pain, and muscle pain. It is also accompanied by symptoms such as a sore throat, sneezing, and coughing. Furthermore, it can lead to complications such as bronchitis, pneumonia, or encephalitis, potentially causing severe illness.

Prevention of Influenza

Influenza is transmitted by inhaling viruses released into the air through coughs or sneezes from infected people. (Droplet transmission)

Additionally, viruses on the hands of infected individuals can spread to others through contact with contaminated objects, leading to further transmission. (Contact transmission)

  • Wash your hands.

Be sure to wash your hands, especially when returning home from outside and before meals.

  • Avoid crowded places and busy downtown areas.

Please refrain from outings to busy places if you are elderly, have a chronic illness, lack sleep or are tired.

  • Be mindful of indoor dryness.

Maintain appropriate humidity indoors (50%–60%) by using a humidifier, etc.

  • Take plenty of rest to boost body strength and immunity.
  • Eat a balanced diet.
  • Get the influenza vaccine shot.

Elderly individuals (generally 65 years and older) are eligible under the Immunization Act for partially publicly funded vaccinations. Please inquire at your local municipal office.

The effectiveness of the influenza vaccine varies depending on the individual. However, it typically takes about two weeks after vaccination to become effective, and its protection is generally believed to last for about five months. Therefore, we recommend getting vaccinated early.

Please consult thoroughly with your doctor before receiving the vaccination.

If you get infected with the influenza virus

  • Get adequate rest.
  • Stay sufficiently hydrated. Anything such as tea, juice, soup is fine.
  • Remember to be considerate of not infecting others.

Cough etiquette
○ Cover your mouth and nose with a tissue when coughing or sneezing and avoid 

 facing others, or distance yourself at least one meter away.

○ Dispose of used tissues in a trash can with a lid and wash your hands.

○ Wear a mask to prevent the spread of infection.

For your own sake and others, please do not overexert yourself, and take a plenty of rest to get better soon!!