3 days popular7 days popular1 month popular3 months popular

Study examines blood test to screen for fatal variant creutzfeldt-jakob disease

A accurately screened for infection with the agent responsible for (vCJD), a fatal neurological disease.

vCJD is a fatal degenerative brain disorder thought to be caused by a misfolded protein (prion) in the brain and contracted most commonly through eating infected beef. Up to 3 million cattle in the United Kingdom may have been infected with BSE (bovine spongiform encephalopathy), and establishing accurate prevalence estimates through screening for vCJD infection would guide public health initiatives.

The researchers previously developed a test to detect low levels of prion protein in the blood. In this study, they used the test on samples from national and centers in the U.S. and the U.K. to see if it was accurate enough to screen large numbers of people. Samples represented U.S. (n=5,000), healthy U.K. donors (n=200), patients with nonprion neurodegenerative disease (n=352), patients in whom a diagnosis was likely (n=105) and patients with confirmed vCJD (n=10).

The test was perfectly specific, meaning it was always negative in negative American donor samples and healthy U.K. patient samples. No samples tested positive from patients with nonprion neurodegenerative disorders. The test found 71.4 percent of patients with vCJD correctly tested positive.

The prion assay (test) in this study is accurate enough to screen populations at risk for vCJD. “Most importantly, the prototype vCJD assay [test] has sufficient performance to justify now screening a large U.K. population sample and at-risk groups to produce an initial estimate of the level of prionemia [prions in the blood] in the U.K. population. … A blood prevalence study would provide essential information for policy makers for deciding if routine vCJD screening is needed for blood, tissue, and organ donations and patients prior to high-risk surgical procedures.”

Source

JAMA Neurol. Published online March 3, 2014. doi:10.1001/.jamaneurol.2013.6001.

Authors made conflict of interest disclosures. This study was funded by the U.K. Medical Research Council and other sources. Please see the articles for additional information, including other authors, author contributions and affiliations, financial disclosures, funding and support, etc.