“Rates of transmission increased from June to July in Sierra Leone and Liberia from 1.4 to 1.7 respectively for every existing case. The statistical analysis is detailed in the paper, “Early transmission dynamics of Ebola virus disease, West Africa, March to August 2014,” published today in Eurosurveillance.”
“Our findings suggest that control of the Ebola epidemic that has taken so many lives could be attained by preventing more than half of the secondary transmissions for each primary case. This could be attained by isolating those with Ebola and tracing each case to its source.”
“Transmission rates are consistent with the rate of spread from prior outbreaks in Central Africa, researchers found.”
(WebMD)
http://www.webmd.com/a-to-z-guides/ebola-fever-virus-infection
“A person who has Ebola but has no symptoms can’t spread the disease, either.”
(CDC)
http://www.cdc.gov/vhf/ebola/symptoms/index.html
The average time between contracting the infection and the start of symptoms (incubation period) is 8 to 10 days, but it can vary between 2 and 21 days.
http://ebola-virus.co.uk/symptoms/
(see “Summary of the symptoms ordering by chronological order:”)