That didn’t seem to work for the one that just died.
Check it out:

The Centers for Disease Control and Prevention (CDC) has produced a video designed to instruct commercial airline crews on what they need to know and do considering that someone suffering from Ebola might end up on one of their flights.

The video advises crew members working in the passenger cabins of commercial airliners on international flights to watch for people “who seem unwell or are using the restroom many times.