/jp/ - Otaku Culture

>>22663356
The top reason is very simple.

In Japan, two big bad susceptible diseases.
One is Spring hay fever =pollen allergy, called 花粉症(kafun-sho),
other one is Winter flu = インフルエンザ(influenza).

In winter, the air is dryer than in spring,
so the mucous membranes of the mouth and nose are dry and susceptible to infection.
https://en.wikipedia.org/wiki/Influenza

No one will die of hay fever, but the flu can kill elderly and small children.
The flu resembles the symptoms of a cold but is harder to cure,
feel very painful bc have higher fever and headache than a cold.