I've just watched a news report on Sky News that said that the second nurse to be confirmed with Ebola flew her outgoing journey 4 days before and her homeward journey 1 day before presenting with Ebola symptoms, the report said that there was 'low risk' to the other passengers on the flight because she wasn't contagious when she flew..... The reporter then went on to say that she (and the first nurse that contracted the disease) came into contact with the Liberian man 3 days before he showed symptoms.... Surely this is a contradiction as to at what point the disease can be passed on?