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Well there are things you could do to figure that out - like perhaps they did an anonymous poll of HIV/AIDs patients asking how often they have unprotected sex. They could then determine a rough estimate of how many people may have gotten HIV/AIds from them and compare that to the number of people actually diagnosed with it each year.
Of course, this is pretty far fetched considering that the epidemic is sweeping the entire world. A poll like this for everyone in the world seems highly unlikely.
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