Vaccinations are only one element in a program of

Vaccinations are only one element in a program of prevention, monitoring and treatment. No one expects anything close to 100% vaccination, or that the doses will be 100% effective. As with TB and other diseases there are developments that require early detection that allows early treatment. Along with this is the fact that Ebola is a virus and viruses continually mutate to the point that vaccines are no longer effective. Think of the flu vaccines that work in limited ways so that the flu strains that have mutated in response to "last year's vaccines" still end up killing thousands each year. The key to the N-Assay is the rapid detection of bacteria and now viruses so that there can be early effective interventions. This is what it does, and it does it earlier and in harsher locations than alternatives.