The virus becomes HIV-1 the most widespread form found today.

该病毒成为今天最广为传播的形式：HIV - 1。

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The fifth was the chimpanzee virus that is the direct ancestor of HIV-1.

第五个是HIV - 1型病毒的先祖黑猩猩病毒。

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The HIV-1 virus, seen here, is the most common (and deadliest) strain of the disease.

这里所看到的HIV - 1病毒是最常见和最致命的疾病菌株。

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Dr.Oduor says in reality, only 1.3 percent of the blood collected is found to be HIV-positive.

VOA: standard.2010.06.04

Last year,he says nearly 1.5-million TB patients were tested for HIV, an increase of 200,000.

VOA: standard.2009.12.09

"We know HIV-1 comes from chimpanzees but we know little beyond this, " he said.

BBC: NEWS | Health | Vaccine link to Aids 'dismissed'

Only occasionally, as with the M strain of HIV-1, does the chatter lead to a serious epidemic.

ECONOMIST: Human malaria started in chimpanzees

However, they also found that the virus is very different to all strains of HIV-1, which has infected humans.

BBC: NEWS | Health | Vaccine link to Aids 'dismissed'