Article: Viruses by National Geographic

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Across
  1. 2. small organisms, or living things, that can be found in all-natural environments
  2. 5. Cycle the process of lysis, which occurs when a virus has infected a cell, replicated new virus particles, and bursts through the cell membrane
  3. 7. having a high degree of resistance to an illness or disease
  4. 8. a living animal or plant on or in which a parasite lives
Down
  1. 1. an illness or sickness characterized by specific signs or symptoms
  2. 3. capable of causing infection
  3. 4. a substance used to stimulate the production of antibodies and provide immunity against one or several diseases
  4. 6. an infectious agent that can only replicate within a host organism