이들이 다른 질병을 함께 앓고 있던 것으로 알려져 "주요 사인이 신종플루 감염에 의한 것인지 밝혀내는 일은 쉽지 않다"고 덧붙였다.
Because they were known to be suffering from other illnesses at the same time, it's difficult to say whether the swine flu infection was the primary cause of death, he noted.