and maybe i will just talk about the false alert question really quickly and then i will have nadina boba can speak to the isolation room issue. you know, the really important thing and the key point i think when thinking about ebola in a patient is their travel history. >> and so i think that once the history of whether a person has traveled to an ebola affected area or has contact with an ebola infected patient, is ascertained and there is... where the ebola infection needs to be ruled out. >> just to be asked for your question about isolation units, there is 102 isolation units in san francisco hospital and so we have a robust system and that might be suspect in a lot of cases. so that is not just like one capacity, every hospital will come on line. >> absolutely, yes. >> >> commissioner singer? >> dr. aragon a couple of comments and questions. one is that it sounds like we have done a terrific job in pushing the information out and getting information in from the federal, and world health organizations, pushing it out to our community, and it sounds like we have a terrific respon