YOU SAID:

They had no idea what was wrong with them, and they worried that they had some contagious disease.

INTO JAPANESE

彼らは何が悪いのかわからず、伝染病があるのではないかと心配していました。

BACK INTO ENGLISH

They weren't sure what was wrong and were worried that there would be an epidemic.

INTO JAPANESE

彼らは何が間違っているのか確信が持てず、流行が起こるのではないかと心配していました。

BACK INTO ENGLISH

They weren't sure what was wrong, and were worried that an outbreak would occur.

INTO JAPANESE

彼らは何が間違っているのか確信が持てず、アウトブレイクが起こるのではないかと心配していました。

BACK INTO ENGLISH

They weren't sure what went wrong, and were worried that an outbreak could happen.

INTO JAPANESE

彼らは何がうまくいかなかったのか確信が持てず、アウトブレイクが起こるのではないかと心配していました。

BACK INTO ENGLISH

They weren't sure what went wrong and were worried that an outbreak could happen.

INTO JAPANESE

彼らは何が間違っていたのか確信が持てず、アウトブレイクが起こるのではないかと心配していました。

BACK INTO ENGLISH

They weren't sure what went wrong and were worried that an outbreak could happen.