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Associated Press
A health worker volunteer talks with a resident on how to prevent and identify the Ebola virus in others, and distributes bars of soap in Freetown, Sierra Leone, Saturday, Sept. 20, 2014. Thousands of health workers began knocking on doors across Sierra Leone on Friday in search of hidden Ebola cases with the entire West African nation locked down in their homes for three days in an unprecedented effort to combat the deadly disease. (AP Photo/Michael Duff)

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