There are no guarantees the vaccine will prove effective and it will take animal research and trials on people to know if it will be.
Another separate experimental Bundibugyo vaccine is also in development, but it is expected to take six to nine months for any dose of that to be ready for testing.
Speaking at Friday’s news briefing in Geneva, Tedros said: “We are now revising our risk assessment to very high at the national level, high at the regional level, and low at the global level.”
He said that “so far, 82 cases have been confirmed in DRC, with seven confirmed deaths”.
Tedros added the situation in neighbouring Uganda – where they have been two confirmed cases of the Bundibugyo species and one death – was “stable” with both cases from people who travelled from neighbouring DR Congo.
Ebola is a rare but deadly disease caused by a virus. Although less deadly than other Ebola species, the rarity of Bundibugyo means there are fewer tools to stop it.
Ebola viruses normally infect animals, typically fruit bats, but outbreaks among humans can sometimes start when people eat or handle infected animals.
On Sunday, the WHO declared a public health emergency of international concern, but said it was not at pandemic level.
