The country has begun vaccinating 50,000 frontline health workers against a different Ebola strain while 20,000 are enrolled in a clinical trial.
Health authorities begin rolling out vaccination trials targeting workers at the centre of the country's Ebola response, according to Al Jazeera.
Medical charity says the study will follow 20,000 frontline workers to assess the effect of the Ervebo vaccine
A new episode of BBC Radio 4's Inside Science programme poses the question of whether personalised cancer vaccines have moved from research to practical treatment.