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There is this little article that im using to study japanese and one of its
passages says:

>
> 国立感染症研究所によると、約3000の病院で6月25日までの1週間にヘルパンギーナがうつったことがわかった人は、1つの病院に平均で5.79人いました。今までの10年でいちばん多くなりました。

I cant grammatically understand this part:

> ヘルパンギーナがうつったことがわかった人

I understand that all of it is a relative clause modifying 人. I dont
understand the grammatical role of ヘルパンギーナがうつったこと.

Is it actually the subject ? How would you write it in a non-relative-clause
form?

I'd appreciate it if anyone could give me a grammatical analysis of this
specific part.
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question
grammar translation relative-clauses
Cant understand this relative clause
> I dont understand the grammatical role of ヘルパンギーナがうつったこと. Is it actually the
> subject?

It is the subject _of わかった_ , yes.

I infer from context that the うつる verb here is 移る, in the sense of "to be
infected/contagious".

Let's understand the entire thing piece by piece:

ヘルパンギーナ -> [mouth blisters](https://en.wikipedia.org/wiki/Herpangina)

ヘルパンギーナがうつった -> mouth blisters infected (someone)

ヘルパンギーナがうつったこと -> _the fact of having been_ infected with mouth blisters
(i.e.: こと is a nominalizer here, which is to say a placeholder noun that is
described by the relative clause ヘルパンギーナがうつった)

ヘルパンギーナがうつったことがわかった -> being infected with mouth blisters was known

ヘルパンギーナがうつったことがわかった人 -> person _who knew about_ (personally) being infected
with mouth blisters

An independent sentence equivalent seems straightforward:
人はヘルパンギーナがうつったことがわかった, "the person knew about being infected with mouth
blisters". (Of course, this still contains its own relative clause. Rather
than nominalizing that, I suppose we could use quotative-と or soemthing.)
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> ヘルパンギーナがうつったことがわかった人

The form of this sentence is:

[Rel clause] + 人

In the relative clause: ヘルパンギーナがうつったことがわかった

こと is the subject which is modified by another relative clause.

分かる in this context means "to be known".

So ヘルパンギーナがうつったことがわかった人 means (considering context)

Literally:

> The people for whom it (the fact they contracted herpangina) is known.

Idiomatically:

> The known people who contracted herpangina

Consider that this clause is the topic of the sentence (marked by は) and as
such it can be interpreted widely depending on what follows. So it could be
the number of people, the place where they got infected, an average, etc. In
your case,

> ヘルパンギーナがうつったことがわかった人は、1つの病院に平均で5.79人いました

> The average of known people who contracted herpangina per hospital was 5.79.

  * The literally translation may have surpassed my knowledge of English grammar. If so, leave me a comment.
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Before 人 was taken out to be modified by the rest of it, the original sentence
would have looked like:

> ヘルパンギーナが **人に** うつったことがわかった。  
>  Herpangina was found to have transmitted (itself) **to people**.  
>  ( _lit._ The fact that herpangina transmitted (itself) to people was
> found.)

(I couldn't find a good intransitive verb that would retain the subject-verb-
destination relationship between ヘルパンギーナ, うつる and 人 and still convey the
meaning more or less accurately.)

This became:

> ヘルパンギーナがうつったことがわかった **人**  
>  the **people** herpangina was found to have transmitted (itself) **to**

The particle に got lost in the process.
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