[Uncle Miltie]

One test for Ebola, the indirect fluorescence assay, is known to have a rather low specificity, and therefore a rather high false negative rate. PCR testing has also been known to miss cases of affliction. (source)
In other words, it is possible for an Ebola test to be negative when the person actually does have Ebola.

http://www.sott.net/article/286856-Ebola-questions-and-answers-transmission-infection-and-false-negative-test-results

[miserare]

They sent him home like they sent Duncan home.

Wait another 4 days.