The ordinary Japanese noun for influenza, used in both everyday and medical contexts. Common collocations include インフルエンザにかかる, インフルエンザが流行する, and インフルエンザの予防接種.
The flu is going around this year.
I caught influenza and was absent from school for a week.
I got a flu vaccination.
My little brother caught the flu and stayed home from school.
This year the flu is spreading earlier than usual.
I got a flu shot before winter arrived.
He missed three days of work because of the flu.
flu vaccine; influenza vaccine