This disease seems so have so much unknown and conflicting info surrounding it. It seems a having a fever (or lack of) is not really an absolute in determining if a person is infected. About 13% of infected people will not present with a fever. And yet this is one of the most used tests for declaring a person clear or infected.
The finding that 87.1% of those infected exhibited fever — but 12.9% did not — illustrates the challenges confronting health authorities as they struggle to contain the epidemic.
This is the article:
Ebola research: Fever not a surefire sign of infection - LA Times