Other thread has the rest of the quote. The one about “spreading in confined spaces”
http://www.freerepublic.com/focus/f-news/3212303/posts?page=1#1
Confined describes air travel....
I suspect this is ‘different’ from the open air tent treatment facilities used in the bush in Africa. So our ‘ideas’ about ease of transmissibility in a clinical setting may not reflect the reality of those when the clinical setting is changed from an open air tent to an enclosed ward or private room in a hospital setting.