dr susan donovan is an infectious disease specialist, she returned from sierra leone, working with the world health organisation, in trying to contain the outbreak. first of all, what do you make of the case in texas? >> i think the case in texas is not unexpected. we have many travellers, health care workers, people in the united states travelling between west africa and the united states. i think the big difference between what we see in africa and the united states is where they have uncontrolled spread of ebola. we don't expect that to happen here. >> you were in sierra leone, i wonder if you can explain the impact it has had on the health infrastructure there. >> that's the untold story. a lot of focus is on ebola. rightly so. the health care system, which was fragile in sierra leone, which was recovering from civil conflict imploded. children are going without treatment, patients with tuberculosis are getting delays in therapy, and patients are avoiding going to hospitals that have ebola treatment or isolation treatments. there's a tremendous amount of concern if they do go to th