The use of oxygen as treatment for disease was first documented by Dr. T.H Oliver, a British physician in India. He was able to cut the death rate of influenza and pneumonia in half during the worldwide flu outbreak of 1918 using hydrogen peroxide intravenously. Oxygen can also be used as therapy in the form of ozone.
In hindsight, this is not surprising as ozone is known to kill bacteria, fungus and viruses and is used all over the world to kill germs in water treatment plants for drinking water. Used in low doses, it can regulate the immune system. Dr. Robert Rowen, board-certified in family practice, emergency medicine and clinical medical toxicology, points out that “it [regulates] your immune system so that if you have an inflammatory disease, it brings it down to tolerable. If you’re infected with Lyme Disease and your immune system is down, it brings it back up….”
So, where does Ebola come into the picture?
Dr. Rowen and Dr. Howard Robins worked out an inexpensive Ebola treatment that involved supplements and ozone treatment. They were then invited by the office of the President of Sierra Leone to come there and train their doctors to treat Ebola.
The rest of their story reads like a fiction thriller. They spoke to more than 100 doctors then as they began training them the assistant Minister of Health called the military Major in charge of the facility and said, “If you value your job, there will be no ozone at [your treatment center].” In spite of this, their ozone protocol cured a doctor of Ebola in 2 days who contracted the disease by accidentally sticking himself with an Ebola infected needle.
Unfortunately, as of now their training has not resumed.
Interestingly, The New England Journal of Medicine reported that the death rate from Ebola started decreasing from the date the ozone training began:

“We have observed a decreasing case fatality rate among inpatients at [Sierra Leone’s treatment center], from 47.7 percent among the first 151 patients (September 20 to October 13), to 31.7 percent among the next 126 patients with a final disposition (October 14 to November 4), to 23.4 percent among the next 304 patients (November 5 to December 7).” (“Ebola in Freetown Area, Sierra Leone — A Case Study of 581 Patients,” December 24, 2014)

The doctors were in Sierra Leone the third week of October. The doctor who was trained and cured survived it in mid-November.
You can read more about what happened in Sierra Leone as well as find doctors trained in ozone therapy here.