Pml ocrevus?

PML stands for progressive multifocal leukoencephalopathy, a rare but serious brain infection caused by the JC virus.

- Ocrevus (ocrelizumab) is associated with a very small risk of PML. The number of cases is much lower than with natalizumab, but it is not zero.
- Risk factors that may increase PML risk with anti‑CD20 therapies (like ocrelizumab) include JC virus exposure/positivity and prior immunosuppressive treatment. Your individual risk depends on your history and treatment course.

What to watch for (seek urgent care if any occur):
- New or worsening weakness, trouble with walking or coordination
- Vision problems, speech or understanding difficulties
- Severe or unusual headaches, confusion, personality or cognitive changes

Monitoring and actions:
- If you’re on Ocrevus, discuss JC virus testing with your doctor if appropriate for you.
- If you develop concerning neurological symptoms, contact your healthcare provider promptly for evaluation (often including MRI and possibly JC virus testing in the CSF).

If you’d like, tell me your situation (on Ocrevus or considering it, any JC virus status, prior immunosuppressants), and I can tailor the info.