Very close contact skin to skin for a period of at least a minute or so with a patient not just symptomatic but quite ill?
There are some in Africa who had only the most fleeting of contact and contracted the disease, but they were dealing with patients near death. The worst seems to be anything that came into contact with a deceased patient in the hours following death, though.
Exactly. Shedding virus particles like crazy!
Thru the smallest cut in the caregiver's skin.
In the case of the Spanish nurse, they are speculating she may have caught it while taking off her space suit.
Two hairdressers voluntarily admitted to ebola unit in Madrid along with 5 others - all in contact with nurse Romero. Total isolated in Spain now 14. Hospital says Romero should have reported error in touching her face, Romero relatives say that Romero wasn’t tested despite reporting symptoms.
http://www.reuters.com/article/2014/10/10/health-ebola-spain-idUSL6N0S51N620141010
The immune systems of victims probably has a lot to do with who is most susceptible to the virus. Some have very weak immune systems and/or other health issues, others do not.