Detailed text transcripts for TV channel - CNN - 20100425:00:08:00
The blood of a human being. most likely, say scientists, a hunter or someone cutting up the chimp for cooking. that simple, seemingly insignificant transmission set off a global epidemic, a pandemic that so far has killed tens of millions of people. scientists now believe hiv crossed into humans in the early 1900s. but it wasn't until air travel increased that it spread and became a global epidemic in the 1980s. is it inevitable that there will be another pandemic like hiv? >> yes. the human population is going to have pandemics. that's just the nature of how we operate now. we are so profound...