As part of a massive campaign to eradicate the spread of Ebola from one of the hardest-hit countries in West Africa, officials in Sierra Leone are now going from house to house looking for unreported cases of the deadly disease.
"In an epidemic like this, really one of the most important pieces of really gaining control is what we call active case finding," Welch said, explaining that this includes going to homes and interviewing families to make sure sick people are given the care they need.
Sierra Leone's President Ernest Bai Koroma also banned all Christmas and New Year's gatherings in an effort to prevent the virus from spreading to rural areas as people travel home for the holidays.
"I know that this is the festive season where Sierra Leoneans often celebrate with families in a flamboyant and joyous manner, but all must be reminded that our country is at war with a vicious enemy," Koroma said, CBS reported.
Watch the clip above for more information about Sierra Leone's new massive campaign.
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