(01 of17)
Open Image ModalEmpty streets are seen, as Sierra Leone government enforces a three day lock down on movement of all people in an attempt to fight the Ebola virus, in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(02 of17)
Open Image ModalAn empty local market area is seen, as Sierra Leone government enforces a three day lock-down on movement of all people in a attempt to fight the Ebola virus, in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(03 of17)
Open Image ModalAn empty local market area is seen, as Sierra Leone government enforces a three day lock-down on movement of all people in a attempt to fight the Ebola virus, in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(04 of17)
Open Image ModalPolice guard a roadblock as Sierra Leone government enforces a three day lock down on movement of all people in an attempt to fight the Ebola virus in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(05 of17)
Open Image ModalAn empty local market area is seen at Waterloo, as the Sierra Leone government enforces a three day lock down on movement of all people in an attempt to fight the Ebola virus, in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(06 of17)
Open Image ModalPolice guard a roadblock as Sierra Leone government enforces a three day lock down on movement of all people in an attempt to fight the Ebola virus, in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(07 of17)
Open Image ModalA trader sits at an empty local market area in Waterloo, as Sierra Leone government enforces a three day lock down on movement of all people in an attempt to fight the Ebola virus, in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(08 of17)
Open Image ModalPolice guard a roadblock as Sierra Leone government enforces a three day lock down on movement of all people in an attempt to fight the Ebola virus in Freetown, Sierra Leone, Friday, Sept. 19, 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) (credit:ASSOCIATED PRESS)
(09 of17)
Open Image ModalIn this Sept. 19, 2014 photo, an Ebola virus health care worker takes a rest outside a Ebola isolation unit in Freetown, Sierra Leone. Sierra Leone confined its 6 million people to their homes Friday for the next three days as the Ebola-ravaged West African country began what was believed to be the most sweeping lockdown against disease since the Middle Ages. (AP Photo/Michael Duff) (credit:ASSOCIATED PRESS)
(10 of17)
Open Image ModalIn this Sept. 19, 2014 photo, Idrissa Kargbo, Sierra Leone's National marathon champion who took part in the New York marathon, in recent years, joins Ebola volunteers going from house to house to look for Ebola virus patients in Freetown, Sierra Leone, 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) (credit:ASSOCIATED PRESS)
(11 of17)
Open Image ModalA health worker volunteer talks with residents 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) (credit:ASSOCIATED PRESS)
(12 of17)
Open Image ModalHealth worker volunteers talk to a resident to 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) (credit:ASSOCIATED PRESS)
(13 of17)
Open Image ModalHealth worker volunteers 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) (credit:ASSOCIATED PRESS)
(14 of17)
Open Image ModalA 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) (credit:ASSOCIATED PRESS)
(15 of17)
Open Image ModalA health worker volunteer talks with residents 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) (credit:ASSOCIATED PRESS)
(16 of17)
Open Image ModalIn this photo taken on Friday, Sept. 19, 2014, Idrissa Kargbo, Sierra Leone's national marathon champion, helps volunteers distribute information on Ebola in Freetown, Sierra Leone. As a boy, marathon runner Idrissa Kargbo sprinted through the villages of Sierra Leone on errands for his grandmother and later as a coffee courier. Now at 23 years old, his times have qualified him for races on three continents. (AP Photo/ Michael Duff) (credit:ASSOCIATED PRESS)
(17 of17)
Open Image ModalIn this photo taken on Friday, Sept. 19, 2014, Idrissa Kargbo, top right, Sierra Leone's national marathon champion, helps volunteers distribute information on Ebola in Freetown, Sierra Leone. As a boy, marathon runner Idrissa Kargbo sprinted through the villages of Sierra Leone on errands for his grandmother and later as a coffee courier. Now at 23 years old, his times have qualified him for races on three continents. (AP Photo/Michael Duff) (credit:ASSOCIATED PRESS)