How did Ebola become infectious to humans?

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  1. #physical
  2. #fluids
  3. #faeces
  4. #contact
  5. #semen
  6. #vomit
  7. #among
  8. #direct
  9. #ebola
  10. #breast
  11. #bodily
  12. #infected
  13. #humans
  14. #blood
  15. #infectious
  16. #transmitted
  17. #urine
  18. #close
  19. #through
  20. #detected
  21. #virus
  22. #being