Why should I be forced to dig through Pubmed for primary literature on the subject? I have my own scientific research to do. So I have to put some faith in the experts in the respective field (doctors and scientists who actually study this problem).
what you are saying is that you don't know if what you claimed to be true is true because you can't be bothered to care enough to actually go and look for yourself. wow, nice.
Based on this helpful review paper, which in practice, is usually as good as primary sources, since experts take the primary source data and put it in perspective together:
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4197285/
Human transmission happens only through close contact with an ill or convalescent person, although at this stage the risk of infection is very small. Studies conducted during the various epidemics have shown that less than one fifth of the people (see Tables 2 and ​and3)3) living with a confirmed or probable primary patient have developed the disease [2426, 35]. All secondary cases were recorded among people with close contact with the patient and exposed to infected biological fluids.
The short of it: no symptoms, no transmission.
First off, that assumption you're making about review papers is not a good one. If you are accustomed to taking the conclusions of review papers at face value on a regular basis you'll find that you can get burned by it. What review papers are great for is for locating other references to primary literature to read.
On the other hand if you're making a regular practice of this then you probably would never realize it since you're just taking things as the reviewer says at face value. Also what's up with the the prestigous journal of such and such that nobody ever heard of:
Journal of Venomous Animals and Toxins including Tropical Diseases... wow.
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ref # 24 - WHO bulletin from 1983 - sample size = 34 people. That sample size is pretty atrocious. too small to produce the robust scientific result you can put on a flag and waive around saying "quarantines are not needed"... good for gleaning hints and lots of data but nothing robust.
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ref #25 - WHO bulletin from 1978 -
"However, in one case of the disease, the only possible source of infection was contact with a probable case 48 hours before the latter developed symptoms." pg. 281 Let's take a moment to reflect on that last bit. I hope you won't mind if I say that last quoted bit from your referenced literature splats a cream pie straight in the face of the clam that the review article you quoted is somehow scientific evidence of... as you put it "no symptoms, no transmission".
Also the Methods: "Information collected on the occurrence of Ebola haemorrhagic fever in Bumba Zone was
largely retrospective." pg. 277 Is this what counts as hard science in your field of study?
This last bit is interesting although widely known today: aka 'don't kill your partner by having sex' - "However, semen from one patient infected with a Zaire strain of Ebola virus in the United Kingdom contained virus for more than 2 months after onset of symptoms" pg. 289
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ref # 26 - WHO bulletin from 1978 - the same bulletin as above!... although this time it's from an international study team vs the "commission" from ref #25. Anyway this one is very interesting to read and they did a hell of a lot of work and yet
the numbers are still too small to be robust.
Here is a quote from that reference that adds a 2nd cream pie to the face however:
"It was possible to relate 48 cases and 27 deaths in Nzara to the original infection in PG, all acquired by direct close contact, usually involving nursing and care of an infected individual. However, in July, September, and October, further unrelated cases continued to occur in cotton factory employees for which no direct contact with previously sick persons could be established." pg. 248
To think that this reference is placed 1 sentence away from this sentence in the review article you cited: "Human transmission happens only through close contact with an ill or convalescent person..." One would almost suspect that the author had formed his opinion on transmission through reading other review articles.
ref # 35 "Transmission of Ebola Hemorrhagic Fever: A Study of Risk Factors in Family Members, Kikwit, Democratic Republic of the Congo, 1995".
It's a SURVEY...
a.k.a. interviews of family members... that is not robust science. It's something. It's more than nothing I suppose.