Top Reddit comment:

No participant developed symptoms more than 6 days after vaccination in either trial arm (immediate or delayed vaccination). This suggests a very fast acting vaccine.

Randomization will stop, and clusters comprised of the contacts and contacts of contacts of cases will only be allocated to the immediate arm. In other words, the WHO will use ring vaccination as a strategy to eliminate Ebola, similar to how ring vaccination was used in the 70s to eradicate small pox.

Big stuff because while the media has shifted attention away from Ebola, transmission is still ongoing in Guinea and Sierra Leone. The response effort is weary. An efficacious vaccine is an invaluable tool.

500+ Reddit comments:

https://reddit.com/r/science/comments/3fa5b9/ebola_vaccine_trial_proves_100_successful_in/

Great news!

Yeah, this is a really big deal. I'm surprised I had not heard more about it.