Describe why the world is more vulnerable to spread of viral infections today compared to 100 years ago?Using hiv as an example, explain how new human pathogens emerge due to viruses jumping from animals to humans
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AIDS is caused by a human immunodeficiency virus (HIV), which originated in ... The pandemic strain of HIV-1 is closely related to a virus found in chimpanzees ...... 100 (11): 6588 ..
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