Variant CJD and blood transfusion: are there additional cases?

Area of Science:

• Neuroscience
• Epidemiology
• Public Health

Background:

• Variant Creutzfeldt-Jakob disease (vCJD) is a fatal neurodegenerative disorder.
• Blood transfusion is a potential route of vCJD transmission.
• Understanding transfusion transmission is crucial for public health safety.

Purpose of the Study:

• To compare demographics and clinical phenotypes of vCJD cases with confirmed, suspected, and no blood transfusion history.
• To assess the likelihood of vCJD transmission through blood products.
• To identify potential differences that may indicate further transfusion-transmitted cases.

Main Methods:

• Retrospective analysis of vCJD cases in the UK.
• Tracing blood transfusion records for vCJD patients.
• Investigating donor records for vCJD development.
• Comparing clinical and demographic data across patient groups.

Main Results:

• Fifteen vCJD cases with transfusion history were identified; records were available for ten.
• Nine transfusion recipients had a mean age of 42.9 years at symptom onset.
• Three cases were linked to transfusion-transmitted vCJD; six were not.
• Donors in non-linked cases were not known to have vCJD, though some have died from other causes.
• Two transfusion-transmitted cases met probable vCJD criteria only post-mortem, with atypical features.

Conclusions:

• The possibility of vCJD transmission through blood transfusions from asymptomatic donors exists.
• Evidence for widespread, unrecognized transfusion transmission is weak.
• The lack of transfusion history in most vCJD cases suggests it is not a primary transmission route for the majority.