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Prepositions with nouns

Using prepositions with “virus”

Different prepositions with virus describe infection, cause, source, or purpose.

Quick answer

Which prepositions are used with “virus”?

Use with after infected or infection. Use by to show cause, as in caused by a virus. Use from for source or protection. Of virus is uncommon except in scientific phrases, and for virus usually appears in technical or medical contexts.

Several patients were infected with a virus.
The illness was caused by a virus.
The vaccine protects people from the virus.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
infected with + virus

Describing infection

With follows infected to name the disease or virus.

He was infected with the virus during the outbreak.
2
caused by + virus

Showing the cause of illness

By introduces the thing causing a condition.

The fever was caused by a virus.
3
protection from + virus

Talking about safety or prevention

From is used after protection, recovery, or distance.

Masks offer protection from the virus.
4
test for + virus

Referring to medical checks

For is common after test, screening, or treatment.

Doctors ordered a test for the virus.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
of virus
Rare: mutation of the virus
Of appears mainly in scientific or technical noun phrases.
for virus
a vaccine for the virus
For can express purpose or treatment, usually after another noun.
with virus
infected with a virus
Shows infection or presence.
from virus
protection from the virus
Shows protection or source.
by virus
The disease is spread by a virus.
Shows cause or means.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using “by” after infected

Use with after infected.

✕ infected by a virus ✓ infected with a virus

Using “of virus” in ordinary descriptions

This sounds incomplete outside technical writing.

✕ the spread of virus ✓ the spread of the virus

Confusing cause and protection

By shows cause; from shows protection or separation.

✕ protected by the virus ✓ protected from the virus

Quick practice

Choose the expression that matches the intended meaning.

1. Many people were infected ___ the virus.
2. The symptoms were caused ___ a virus.
3. The medicine offers protection ___ the virus.

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Frequently asked questions

Is “infected by a virus” wrong?

It appears occasionally, but infected with a virus is more standard and natural.

When is “of virus” used?

Mostly in scientific phrases such as structure of the virus.

Can I say “test for a virus”?

Yes. For is common after test, screening, and treatment nouns.

of, about, against, to or for racism? of, about, for, in or on friendship? of, about, for, on or to thing? of, about, for, to or with sex? of, about, on, to or for moon? "of access" or "with access"? "of accommodation" or "for accommodation"? "of accuracy" or "for accuracy"? "of action" or "in action"? "of actor", "with actor" or "by actor"? "of address" or "to address"? "of administration" or "in administration"?

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