Viruses are very small, not visible, even at the microscopic and the virus is different from other regular virus do not have cell membranes, and viruses do not have their metabolism when outside the host cell, but can increase the number and address in host can generate many kinds of virus enzymes and metabolism. Therefore, the existence of the virus, so it is just a "particle" (Living particle, or Virion) only. In doing so, the virus particle is an interesting life. In addition to disease, and also for treatment of diseases such as the vaccine can be made.
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