Statistics from Altmetric.com
If you wish to reuse any or all of this article please use the link below which will take you to the Copyright Clearance Center’s RightsLink service. You will be able to get a quick price and instant permission to reuse the content in many different ways.
We read with interest the recent article by Verbeeck et al (Gut 2008;57:1393–7) on JC viral loads as a predictor of progressive multifocal leukoencephalopathy (PML) in patients with Crohn’s disease, but we have found some misconceptions.
The authors wrongly state that “Although PML has been associated with immunosuppression as a consequence of organ transplantation and haematological malignancies, it has not been associated with immune-mediated disorders such as MS, Crohn’s disease or rheumatoid arthritis despite the immunosuppressive therapy used to treat their illnesses”. Many case reports exist for PML in such cohorts1–7 and PML is likely to arise in …
Competing interests: None.