Virus
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“The spreading of viruses has been a serious problem in the past in many regions of space, particularly in well-inhabited regions such as your own. This is one of the reasons why humanity’s future ventures into space are viewed with such trepidation. The possibility of engaging with human beings and being exposed to such an unprecedented and unexpected degree of biological influence is looked upon with great concern. This is why anyone visiting this world, even currently, cannot live here and must take great precautions to protect themselves against the biological environment of the world.
- --Life in the Universe, Chapter 2: A Brief History of Visitation to Earth