Ebola is not airborne. Ebola is spread by contact with infected bodily fluids. Think about it people: If Ebola was airborne, do you think there would just be 8000 cases in West Africa? There would have been millions of people infected by now! If Ebola was airborne it would be spreading as fast as the flu. This is clearly not happening. Only persons who come in direct contact with infected individuals are getting it.
Why are health workers wearing protective gear getting it? Ironically, many healthcare workers are probably getting it because they're wearing protective gear! You see, the protective gear gives such workers a sense of security and so they're not too concerned about the patient's bodily fluids getting on them (and caring for Ebola patients is a messy job involving exposure to much bodily fluids as patients need to be cleaned from having diarroeah, vomiting, bleeding, etc) So if the protective gear is not full proof, that sense of security that the caregiver has, is actually a false sense of security and the caregiver is actually over-exposing himself without even realizing it.
Even if the protective gear adequately shields the caregiver, the weakest link in terms of protection is actually the removal of the fluid-soiled gear. It can be very tricky to remove gear tainted with bodily fluids without getting some of that fluid on you. For this reason I think hazmat suits should be used because they leave no part of the body exposed and can be completely showered over with disinfectant to make the suit germ free before removing it.
" for that professional ( two of them) to contract the disease says a lot about the degree of contagiousness of that virus."
No. It says a lot about the poor nature of the protective gear they're using. These workers aren't using hazmat suits but makshift gear that leaves some parts exposed and which presents the risk of contamination when they're being removed - regardless of how careful you try to be!