However, 3 to 4 weeks later, both patients developed immune reconstitution inflammatory syndrome (IRIS), as evidenced by enlargement and contrast enhancement of PML lesions, appearance of new ...

This infection is called progressive multifocal leukoencephalopathy (PML). PML can be fatal. Read on to learn more about the JC virus and the risks for people with MS. Anywhere from 50% to 90% of ...