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Frieden and other officials say such a move would be counterproductive, citing lessons learned from the SARS outbreak a decade ago. "The SARS outbreak cost the world more than $40 billion, but it wasn't to control the outbreak," says Frieden. "Those were costs from unnecessary and ineffective travel restrictions and trade changes that could have been avoided." The government announced Wednesday that it was stepping up protective measures at five airports, where authorities will screen travelers from Liberia, Sierra Leone, and Guinea with targeted questions and fever checks, an action, officials acknowledge, that was taken not only to stop the spread of the disease but simply to make people feel safer. According to Berman, the message is this: Be afraid of Ebola. Just not too afraid.