In an early stage，in Americans’eyes，Ebola was only a disease characterized by fever in Africa．      then a man from west Africa died from Ebola at a hospital in Dallas，Texas．And two nurses       for him became infected with the virus，which made the US government issue new guidelines(指南)to          health workers．
Top American        have repeatedly said that most people have little chance of being infected．Experts have         that Ebola can only be spread through          with an infected person’s body fluid-like blood．But it          many Americans are        what they have heard．
A recent survey found more than 80 percent of Americans believe that Ebola can be spread in many           ，including air forced through the nose or mouth．The Harvard School of Public Health          the findings．The study also showed that most adults fear there will be a(n)           of Ebola in the United States soon．
       survey found that more than 70 percent of Americans would support calls to       travel to and from Ebola-affected parts of Africa．
Thomas Frieden heads the U.S．Centers for Disease Control and Prevention．When asked whether          officials had considered a travel ban，Mr．Frieden had         to say：“We won’t be able to check travelers for          when they leave or when they arrive. We won’t be able , as we do        ,to take a detailed history to see if they were             when they arrive. When they arrive, we wouldn’t be able to impose quarantine（强加隔离）as we now can if they have          contact.”
Last week , President Barack Obama urged Americans not to         what he called “ panic or fear “.
This week，the administration announced that all travelers arriving in the United States from some African nations are required to pass through one of five airports．

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