Zika Virus Linked with Another Brain Disease: What's ADEM?

Some people infected with the Zika virus may develop a rare neurological disorder that is similar to multiple sclerosis, a new study from Brazil suggests. The study reports two cases of people who were infected with the Zika virus and who later developed a condition called acute disseminated encephalomyelitis (ADEM). In people with this condition, the body's own immune system causes swelling in the brain and spinal cord, and damages the protective coating of nerve fibers called myelin.