Plural Of Flu

What is the accumulated form of the flu? 3

I typed Fils in Microsoft Word processor and underlined it in red.

update

The flu, like a disease.

I don't think it's a chimney because it's a chimney // fishing net.

The phrase says: Why is this channel so smooth from the previous channel?

Because influenza is safe for influenza, influenza viruses, or viruses of the Ortmyxoviridae family.

Plural flow

Plural Of Flu

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What is the accumulated form of the flu?
I typed Fils in Microsoft Word processor and underlined it in red.
2 flu
As a disease, the flu is actually the flu, so the accumulated flu. Obviously it's contraction, then flu, then accumulation is an injection.
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Smoke channel