A vermifugação é importante.

Vermifugação means deworming: the process of giving treatment to eliminate worms/parasites.

In Brazilian Portuguese, this word is common especially in:

• veterinary contexts
• pet care
• livestock care
• sometimes human health contexts, depending on the situation

It is a noun, not a verb.

A is the definite article meaning the.

So structurally, the sentence is:

• A vermifugação = the deworming / deworming
• é = is
• importante = important

Portuguese uses definite articles more often than English does. In English, we often say simply Deworming is important, but in Portuguese A vermifugação é importante sounds natural.

Because é comes from ser, which is used for:

• definitions
• general truths
• essential characteristics
• permanent or broadly valid statements

Here, A vermifugação é importante is a general statement: deworming is important.

If you used está, it would sound more like a temporary condition, which does not fit as well here.

So:

• é importante = is important in a general sense
• está importante would normally sound unnatural here

Importante is an adjective with the same form for both masculine and feminine singular nouns.

So you get:

• o exame é importante
• a vermifugação é importante

The adjective does change in the plural:

• os exames são importantes
• as vermifugações são importantes

So in this sentence, importante agrees in number but not visibly in gender.

Yes. Nouns ending in -ção are generally feminine in Portuguese.

That is why we say:

• a vermifugação
• a vacinação
• a medicação
• a prevenção

So the article A matches the feminine noun vermifugação.

A helpful approximate pronunciation is:

ver-mi-fu-ga-SOWN

More carefully in Brazilian Portuguese:

• ver = sounds like vehr
• mi = mee
• fu = foo
• ga = gah
• ção = a nasal sound, roughly sown but nasalized

Important points:

• The stress is on the last syllable: -ção
• ção is a very common ending in Portuguese
• The ã sound is nasal, so it is not exactly like English ow

The related verb is vermifugar, which means to deworm.

Examples:

• É preciso vermifugar o cão. = It is necessary to deworm the dog.
• Nós vamos vermifugar os gatos. = We are going to deworm the cats.

So:

• vermifugar = verb
• vermifugação = noun, deworming

You might hear article omission in some contexts, but A vermifugação é importante is the more standard and natural full sentence.

In Portuguese, abstract nouns often appear with the definite article, especially in general statements.

So for a learner, the safest version is:

• A vermifugação é importante.

Yes. In practice, vermifugação is very often used for animals, especially:

• dogs
• cats
• horses
• farm animals

It can also be used in broader health contexts, but many learners will most often see it in veterinary language.

So depending on the context, the sentence may mean something like:

• deworming pets is important
• deworming treatment is important

The plural would be:

As vermifugações são importantes.

Changes:

• A → As
• vermifugação → vermifugações
• é → são
• importante → importantes

That said, in real usage, the singular is often more natural when speaking generally:

• A vermifugação é importante.

Yes, it sounds fairly neutral to formal, and it is completely natural in:

• health information
• veterinary advice
• educational materials
• informational writing

In casual speech, people might also use more everyday phrasing depending on the context, such as talking about dar vermífugo in pet-care situations. But A vermifugação é importante is correct, clear, and natural.

Here are some very similar patterns:

• A vacinação é importante. = Vaccination is important.
• A hidratação é importante. = Hydration is important.
• A prevenção é importante. = Prevention is important.
• A alimentação é importante. = Nutrition/Food intake is important.

This pattern is very common in Portuguese:

A + noun + é + adjective

It is a useful structure for making general statements.