If you read the WHO report carefully, what they’re saying is the 90-th percentile of cases seem to break out in 42 days. I think. I’ve got the report here somewhere, but it doesn’t matter.
The WHO was saying quite recently they didn’t understand why they were having such a hard time stopping the spread/outbreak.
This would explain why: your basic data and assumptions of a 21 day incubation period as an absolute are wrong.
Your assumption that the virus isn’t spread through airborne aerosolized secretions is WRONG.
Your assumptions about this being a fragile virus which doesn’t persist in the environment: wrong.
The US Army has known of airborne transmission for decades (read The Hot Zone).
German studies demonstrated persistence of Marburg agent for upwards of 4 to 5 days.
Thing is, the basic science hasn’t been completed with Ebola yet. It hasn’t been consolidated and packaged in a way it can be presented to small-minded entrenched government socialist bureaucrats at the CDC, NIH and WHO so they can make sense out of it.
The data are there, putting it together is, apparently, beyond the capacities or capability of said agencies.
It’s hard to do considering that the natural sources, especially monkeys, are dead before we figure out that the natural reservoir has ebola. The efficiency of ebola in killing the infectees makes it hard to understand.