Origin of AIDS - Emergence - Conditions For Successful Zoonosis

Conditions For Successful Zoonosis

Zoonosis (transfer of a pathogen from non-human animals to humans) and subsequent spread of the pathogen between humans, requires the following conditions:

  1. a human population;
  2. a nearby population of a host animal;
  3. an infectious pathogen in the host animal that can spread from animal to human;
  4. interaction between the species to transmit enough of the pathogen to humans to establish a human foothold, which could have taken millions of individual exposures;
  5. ability of the pathogen to spread from human to human (perhaps acquired by mutation);
  6. some process allowing the pathogen to disperse widely, preventing the infection from "burning out" by either killing off its human hosts or provoking immunity in a local population of humans.

Read more about this topic:  Origin Of AIDS, Emergence

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