Many signs point to the viral load not being highly infectious at the beginning. Duncan was sent back to his home by the hospital and lived with his fiance who was taking care of him for two days before being readmitted. She wore no PPE yet appears to be uninfected. If sitting next to someone infected on a bus or subway is enough to pass it on, there would be a million cases in West Africa by now, not 10K. It appears to be primarily caregivers at the later stages of the disease, and the custom of kissing corpses that appear to be spreading the disease because the viral load is extreme at that stage. This doesn't mean that the potential contacts of this person should not be traced or that it was good idea for him to go bowling, but the sky isn't falling just yet.
Ebola can spread only after a person begins to show symptoms. And that takes ~21 days. Or putting it straight, for it to spread from one person to another it would take 21 days of period in between getting infected and spreading it to others.
Though the growth of number of patients with Ebola is definitely exponential. Please note it takes 21 days for the each multiplication to happen. It started in March and has been been spreading since, 10K is pretty large for a 7 month period.
>>but the sky isn't falling just yet.
In things like this you won't know when the sky will start falling apart. And generally when that happens its already too late, and you would be staring at a pretty big damage.
No body knows how many people have been infected, or will be infected in the next multiplication.
Which is why WHO suspects ~1.4 million could get infected by January. By then it would be too late.
