YOU SAID:

What was concerning was that virtually everybody who had been affected by this was dead.

INTO JAPANESE

心配だったのは、これによって影響を受けたほぼ全員が死亡したということでした。

BACK INTO ENGLISH

The worry was that almost everyone affected by this had died.

INTO JAPANESE

心配は、これによって影響を受けたほとんどすべてが死んだということでした。

BACK INTO ENGLISH

The worry was that almost everything affected by this died.

INTO JAPANESE

心配は、これによって影響を受けるほとんどすべてが死んだということでした。

BACK INTO ENGLISH

The worry was that almost everything affected by this died.