当科学家们研究感染黑猩猩的病毒菌株时，他们发现这是与首先感染人类的病毒所密切相关的一种病毒。
And when scientists looked at the strain infecting the chimps, they found that it was a close relative of the virus that first infected humans.
这里所看到的HIV - 1病毒是最常见和最致命的疾病菌株。
The HIV-1 virus, seen here, is the most common (and deadliest) strain of the disease.
幸运的是，这种菌株的毒性远远小于人们原先所担心的，但也造成了约19,000人死亡。
Fortunately, the strain was far less virulent than originally feared, killing about 19,000 people.
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