Provide hand washing stations and face masks at every airport.
My idea is for every airport across the world.
Hand washing is the most effective way to prevent the spread of infection and disease. This idea is basic, yet very preventive in that it stops the disease at every country's port of entry, thereby not allowing it to spread by travel. Additionally, the required use of face masks during travel ensures that if someone has ebola but is not yet aware that they do, they will not be able to spread the infection.