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Technically a variant did go airborne. A version infected an import holding area containing imported monkeys in Reston Virginia. While it tested as Ebola at the time, it was non symptomatic in humans. In the monkeys it was lethal and airborne.
https://en.m.wikipedia.org/wiki/Reston_virus
This is actually a gross misunderstanding of the difference between aerosol (droplet) and airborne transmission of pathogens. Many infections (flu, cold, etc.) infect the respiratory tract and are spread by droplets (e.g. sneezing). Some pathogens (e.g. TB) are airborne, which allows them to travel much farther and linger much longer. Droplet precautions include wearing of a surgical type mask. Airborne precautions require N95 mask and negative pressure rooms. The Reston virus was suspected to be transmitted through aerosol in actual cases and had been demonstrated to be capable of this in experiments, but it was not airborne, nor was it really conclusively determined to be actually spread in the wild through aerosol. Unlike Ebola, it could infect the respiratory tract.
Yes, an aerosol Ebola would be a bigger infectious threat, but far far from the danger of airborne Ebola. The first seems quite unlikely and the second seems nearly impossible.
