No it hasn't.
Every human being is different. 21 days is a very conservative estimate of a 95% confidence interval that you will develop symptoms if exposed, within two standard deviations. The measured standard deviation is 4.3 days. For "most" people (~70%) symptoms will develop between 8 and 12 days of infection.
If you stop isolating people after only 12 days, 30% of infected patients are going to be turned loose into general population. Some studies are now recommending 25 days.
25 days of isolation would be a good number to use to err on the side of caution.
that’s not what I meant..
they are saying that is takes 21 days for Ebola to show up..
that’s not true..
it can be within days..
I bet if those passengers were given a blood test it would show up no matter how much Motrin they take to hide a fever...
and yes they should be in quarantine for more than 21 days...