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Liberia has officially been declared Ebola-free.  The World Health Organisation made the announcement after the West African country went 42 days without a new case of the virus.  Ebola has killed more than 4,500 Liberians over the past 13 months and affected thousands more.  Katerina Vittozzi met with one Liberian who not only helped treat the sick in Ebola Treatment Units, or Ebola Treatment Units, but who is also now helping survivors build a new life.