The Eternal Arms Race Reading Crossword

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Across
  1. 2. The ongoing struggle between pathogens and the immune system is often described as an eternal ______.
  2. 4. The first illness caused by varicella-zoster virus before it becomes dormant.
  3. 5. After chickenpox, the varicella-zoster virus can lie dormant and later cause ______.
  4. 7. This virus changes so rapidly that multiple strains circulate inside one infected person.
  5. 9. This virus tricks the immune system by making a protein similar to one found on healthy cells.
  6. 13. These specialized immune cells, targeted by HIV, help coordinate the body's defense.
  7. 15. The adaptive immune systems's response depends on the type of ___ and its survival strategy.
Down
  1. 1. Countries invest heavily in these tools of defense, just like the body invests in immunity.
  2. 3. The replication of Hepatitis B virus is _____, continuing at low levels in the body.
  3. 6. The process in which traits that help pathogens or immune systems succeed are passed on is called _____ selection.
  4. 8. The outward signs of an infection are known as _____.
  5. 10. When a pathogen makes genetic changes to look different to the immune system, it is changing it's _______.
  6. 11. High ____ rates are effective in stopping outbreaks and diseases.
  7. 12. Some pathogens live silently until the immune system is ___.
  8. 14. If the immune system fails to control a ____, the person may not survive.