Source? Because a big talking point for the last 6 months has been that asymptomatic transmission was a thing and that's why "feeling sick" was not a good indicator of how contagious you were.
That's true for every disease caused by viruses. This one is no different in this regard. Just ask or hear from any honest doctor that has worked on the field, in Africa for example where ebola kills 40%, not 0.02% like this one.