YOU SAID:
He didn't know that he was infected.
INTO JAPANESE
彼は自分が感染していることを知りませんでした。
BACK INTO ENGLISH
He didn't know he was infected.
INTO JAPANESE
彼は自分が感染していることを知りませんでした。
BACK INTO ENGLISH
He didn't know he was infected.
That didn't even make that much sense in English.