If this virus was in thousands of individuals at this point, why was it the case that it took us until 1984 to be able to discover this virus?
그 당시에 이 바이러스가 수천 명의 몸에 들어있었다면, 왜 1984년에 와서야 이 바이러스를 밝힐 수 있었을까요?