Even Koch recognized that in some cases not all of his conditions could be met, so other evidence should also be considered. This is particularly true when the germ is a virus rather than a bacterium.16 Modern scientists are willing to consider a wide range of evidence. In particular, we can ask five key questions:
- Do surveillance statistics show a relationship between HIV and AIDS?
- How well does HIV infection predict illness and death?
- Do drugs designed to combat HIV benefit people with AIDS?
- Are there any credible causes besides HIV?
- What can we learn from Africa?
We'll address these questions after looking at Koch's Postulates.
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