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Associated Press
A health worker volunteer marks a home with chalk to identify that it has been visited, as they distribute bars of soap and information about Ebola 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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