If I were you, I would not be worried. Professionals are doing everything they can to stop the spread of the Ebola virus.
The people that do have the virus in the US are currently under quarantine. This means that they are not allowed to come into contact with any other human being, unless those humans are wearing specially designed protective gear.
Family and friends of these people are also under quarantine to further prevent any spread,
I am by no mean saying that Ebola is not a threat. It is a very dangerous virus that has killed a lot of people. However, there have been quite a few outbreaks in the past that have been similar to this one, and in the end all have either faded out on their own, or been dealt with by professionals.
Also, compared to the amount of time that the disease has been around, it has spread to relatively few countries. Those it has spread to outside of Africa, have done a very good job of preventing any further spreading in that country.
I can understand why you are worried, but I would advise not to think about it or let it affect your everyday life. Hospitals are equipped to deal with outbreaks such as these, so leave it in their capable hands.
