Multiple sclerosis (MS) and other conditions affecting the immune system can activate the John Cunningham (JC) virus, causing a potentially life threatening infection. The JC virus is common ...

Measles outbreaks in West Texas and New Mexico are now up to more than 250 cases, and two unvaccinated people have died from ...

Measles is rarely seen in the United States, but Americans are growing more concerned about the preventable virus as cases ...