I haven't been following the details surrounding ebola too closely so I only learned this morning that an infected person becomes contagious once they begin to show symptoms which is anywhere from 2-21 days. This may be one reason why instead of testing every potentially inspected person, the policy is to observe them until they begin to show signs of infection. Other possible reasons may include the cost and the impracticability of testing everyone and keeping them in quarantine while waiting for results which can take from 24-72 hours.

I can imagine a scenario where there aren't enough people to monitor all the potentially infected victims and thus testing them right away would become practical if not absolutely necessary to contain the virus and any panic that might ensue from a major breach. There are many benefits from a test that could detect and identify deadly viruses that kill quickly, such as ebola and the enterovius that was mentioned in the PR. According to WHO, the mortality rate of ebola is between 50 and 90%. This is a very scary fact. A major breach could easily impact the economy as people decide to stay home in fear instead of going about their lives.