Friday, February 06, 2015

Evaluation of the protection of primates transfused with variant Creutzfeldt-Jakob disease–infected blood products filtered with prion removal devices: a 5-year update

Original Research


Evaluation of the protection of primates transfused with variant Creutzfeldt-Jakob disease–infected blood products filtered with prion removal devices: a 5-year update




Nathalie Lescoutra-Etchegaray, Nina Jaffré, Chryslain Sumian, Valérie Durand, Evelyne Correia, Jacqueline Mikol, Sophie Luccantoni-Freire, Audrey Culeux, Jean-Philippe Deslys, Emmanuel E. Comoy


First published: 3 February


DOI: 10.1111/trf.12999View/save




This work was supported by a grant from Agence Nationale de la Recherche (ANR), Project PRIONSECUR ANR05PRIB02302.






Analysis of archived appendix samples reveals that one in 2000 individuals in the United Kingdom may carry the infectious prion protein associated with variant Creutzfeldt-Jakob disease (vCJD), raising questions about the risk of transfusion transmission from apparently healthy carriers. Blood leukoreduction shows limited efficiency against prions. Therefore, in absence of antemortem diagnostic tests, prion removal filters, including the P-Capt filter were designed to improve blood transfusion safety.




We evaluated the performances of two filters, the P-Capt and one prototype (PMC#005), with blood-borne infectivity in two independent experiments. Blood was drawn twice from prion-infected macaques. Corresponding RBCCs were prepared according to two different procedures: in Study A, the leukoreduction step was followed by the filtration through the P-Capt. In Study B, the leukoreduction and prion removal were performed simultaneously through the PMC#005. For each study, two groups of three animals were transfused twice with samples before or after filtration.




Among the six macaques transfused with nonfiltered samples, five developed neurologic signs but only four exhibited peripheral detectable protease-resistant prion protein (PrPres) accumulation. In Study A, the three animals transfused with P-Capt–filtered samples remain asymptomatic and devoid of PrPres in lymph node biopsies 6 years after the transfusion. In Study B, one animal transfused with PMC#005-filtered samples developed vCJD.




After 5 to 6 years of progress, this ongoing study provides encouraging results on the prion blood removal performances of the P-Capt filter in macaques, an utmost relevant model for human prion diseases.







Wednesday, July 23, 2014


After the storm? UK blood safety and the risk of variant Creutzfeldt-Jakob Disease



please remember, all iatrogenic CJD is, is sporadic CJD, until route and source of the iatrogenic event i.e. route and source is documented, and then put into the public domain. this very seldom happens. ...


Thursday, January 22, 2015


Transmission properties of atypical Creutzfeldt-Jakob disease: a clue to disease etiology?



Friday, January 10, 2014


vpspr, sgss, sffi, TSE, an iatrogenic by-product of gss, ffi, familial type prion disease, what it ???



Thursday, January 15, 2015


41-year-old Navy Commander with sporadic Creutzfeldt–Jakob disease CJD TSE Prion: Case Report



 Saturday, January 17, 2015


*** Becky Lockhart 46, Utah’s first female House speaker, dies diagnosed with the extremely rare Creutzfeldt-Jakob disease




 Tuesday, December 30, 2014


TSEAC USA Reason For Recalls Blood products, collected from a donors considered to be at increased risk for Creutzfeldt-Jakob Disease (CJD), were distributed END OF YEAR REPORT 2014





Sunday, November 23, 2014


*** Confirmed Variant Creutzfeldt-Jakob Disease (variant CJD) Case in Texas in June 2014 confirmed as USA case NOT European ***


the patient had resided in Kuwait, Russia and Lebanon. The completed investigation did not support the patient's having had extended travel to European countries, including the United Kingdom, or travel to Saudi Arabia. The specific overseas country where this patient’s infection occurred is less clear largely because the investigation did not definitely link him to a country where other known vCJD cases likely had been infected.



Sunday, December 14, 2014


*** ALERT new variant Creutzfeldt Jakob Disease nvCJD or vCJD, sporadic CJD strains, TSE prion aka Mad Cow Disease United States of America Update December 14, 2014 Report ***



price of prion poker goes up again with this study. I strongly urge the United States FDA et al to revisit their failed ruminant mad cow feed ban, where still to this day, the feed ban does NOT include cervids. ...


Saturday, January 31, 2015


European red deer (Cervus elaphus elaphus) are susceptible to Bovine Spongiform Encephalopathy BSE by Oral Alimentary route



Saturday, January 31, 2015


RAPID ADVICE 17-2014 : Evaluation of the risk for public health of casings in countries with a “negligible risk status for BSE” and on the risk of modification of the list of specified risk materials (SRM) with regard to BSE



Saturday, January 24, 2015


Bovine Spongiform Encephalopathy: Atypical Pros and Cons



Discussion: The C, L and H type BSE cases in Canada exhibit molecular characteristics similar to those described for classical and atypical BSE cases from Europe and Japan. *** This supports the theory that the importation of BSE contaminated feedstuff is the source of C-type BSE in Canada. *** It also suggests a similar cause or source for atypical BSE in these countries. ***


see page 176 of 201 pages...tss



*** Singeltary reply ; Molecular, Biochemical and Genetic Characteristics of BSE in Canada Singeltary reply ;



ruminant feed ban for cervids in the United States ?


31 Jan 2015 at 20:14 GMT



Self-Propagative Replication of Ab Oligomers Suggests Potential Transmissibility in Alzheimer Disease


Received July 24, 2014; Accepted September 16, 2014; Published November 3, 2014


Singeltary comment ;



re-Human Prion Diseases in the United States


Posted by flounder on 01 Jan 2010 at 18:11 GMT





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