While PML (progressive multifocal leukoencephalopathy) sounds scary, advances are being made in its diagnosis and treatment.
The first question is: who is at risk to get PML? The JC virus that causes PML is a common virus that many of us have had since childhood without even knowing it. Most people (with healthy immune systems) don't develop PML because the body's natural immune defenses are able to keep the virus in check. White blood cells (lymphocytes, leukocytes) constantly scavenge the...

