The virus spreads from direct person-to-person contact. But here's what makes it especially lethal: it persists in corpses, and funeral practices often take place precisely when bodies are most infectious.

900 suspected cases and 223 deaths have been linked to an outbreak of Ebola in the Democratic Republic of Congo

The virus spreads from direct person-to-person contact. But here's what makes it especially lethal: it persists in corpses, and funeral practices often take place precisely when…