viruses

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Across
  1. 4. viruses can infect different living organisms, so they cause ...
  2. 7. they are found wherever there is life and have probably existed since living cells first evolved
  3. 9. common causes of viral gastroenteritis
  4. 10. the property of a system in which variables are regulated so that internal conditions remain stable and relatively constant
  5. 11. Latin word "virus" referres to it
  6. 13. a worldwide epidemic
  7. 15. material inside a virion
  8. 18. a biological preparation that provides active acquired immunity to a particular disease, a cheap and effective way of preventing infections
Down
  1. 1. medicine which has no effect on viruses
  2. 2. animals which can transmit viruses
  3. 3. viruses don't reproduce, they ...
  4. 5. desease brought to the Americas by European colonists
  5. 6. viruses which are spread by coughing and sneezing
  6. 8. the study of viruses
  7. 12. viral infections in animals provoke a kind of response, that usually eliminates the infecting virus
  8. 13. an infectious agent such as a virus
  9. 14. a protein coat which surrounds and protects a virion
  10. 16. an example of common human disease caused by viruses
  11. 17. one of several viruses transmitted through sexual contact and by exposure to infected blood
  12. 19. virus is a small infectious ...