The World Health Organization, WHO, says it may be impossible to use a vaccine to tackle the new Ebola outbreak in the Democratic Republic of Congo.
Officials are yet to confirm the particular strain of Ebola causing the outbreak, which may have killed 20 people.
But WHO’s emergency response chief Peter Salama says it could be the Zaire, Sudan or Bundibugyo strain.
He says the vaccine used in the last Ebola outbreak may be an option if it is the Zaire strain.
However, Salama says, if it’s another strain, the situation will be much more complex and they may not have any vaccine options.