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http://virologydownunder.blogspot.com/2014/08/ebola-virus-may-be-spread-by-droplets.html "Direct contact includes physical touch but also contact with infectious droplets; the contact is directly from one human to the next, rather than indirectly via an intermediate object or a lingering cloud of infectious particles. You cannot catch EVD by an airborne route, but you may from droplet sprays. Wait, what?? This is where a simple definition becomes really important." .... "Why that is so is not known, but perhaps it is because this virus does not survive being dried down, or that primates don’t produce enough virus in what is coughed out to make infectious droplet nuclei. To be clear, there may be some EBOV in these droplet nuclei - but it has never been shown to cause disease, even when that route has been looked for in the same household as a case of EVD."