The Ebola epidemic in West Africa is the deadliest in history, taking the lives of more than 4,000 people to date and infecting more than 8,400 individuals in the region. To provide flexible funding to help meet the most urgent on the ground needs, Facebook Founder and CEO Mark Zuckerberg and his wife Dr. Priscilla Chan today made a grant of $25 million from their donor-advised fund at Silicon Valley Community Foundation to the CDC Foundation.