Ebola scares the hell out of me, but it is difficult to weaponize. The problem is persistence. Viruses like Ebola are destroyed very quickly by UV radiation which quickly damages the RNA contained in the virus. (Ebola and similar virii do not have DNA, only RNA, they require the DNA of host species to reproduce).
So, Ebola, Marburg and other Hemmorhagic fever viruses essentially require direct inhalation or ingestion of a liquid virus-laden media aerosolized in the air, and that within a relatively short time of release (at least in open air). A release in a dark environment such as a subway, might last longer.
Most virii are also extremely vulnerable to oxidation effects...oxygen rich atmospheres destroy them quickly, and harsh chemicals kill them fast as well...bleach, ammonia, etc. High heat, etc. are pretty serious issues...so your delivbery system needs to keep the heat and potentially virus killing chemicals down.
All this is to say that while Ebola and similar virii are nasty bugs capable of inflicting horrible casualties (Marburg has a roughly 50% mortality rate among those infected while various strains of Ebola have mortality rates between 60 and 95%) they are a serious PITA to weaponize effectively including delivery systems etc. They are far more effective as terrorist weapons than battlefield weapons.
As far as treatments are concerned, survivor's blood has shown some utility in treatment by introducing immunogens and antibodies into the victim's bloodstream, but treatment really must begin relatively early to give the body a jump start on the virus.
No one really knows where these virii come from. There is no known host reservoir in the wild.
By contrast, smallpox, while only 30% fatal is highly debilitating and VERY, VERY contagious. Pretty much anyone who has significant contact with a victim will get smallpox and just a little less than a 3rd of those infected will die, many more will suffer permanent injuries and most survivors will suffer serious and permanent scarring. The big problem is that with a large percentage of the population infected, activity at all levels of society will slam on the brakes as the workforce is debillitated. The military, which is regularly vaccinated for smallpox, would probably be okay, but it's resources would be stretched thin coping with the epidemic and the attendant difficulties. CDC now has sufficient vaccine laid up to treat every American, but the vaccine has some nasty side effects in some people potentially crippling or even lethal side effects.
Any nationa that uses bioweapons against another nation deserves to become a non-nation.
I am not as willing as others to advocate a nuclear solution. Turning an entire country, 99.9999% of whose population would likewise be horrified at the use of biological weapons on other human beings, into a glass plated oil-field is not the act of a civilized nation. It is a supreme act of vengeance and I'm not certain we or anyone else is entitled to that level of vengeance. On the other hand, deposing and executing the entire government and military command structure of that country and replacing it with an occupation government and no native military would be entirely warranted.