Measurement of the scrapie agent using an incubation time interval assay.

Abstract:

:The titer of the scrapie agent was determined by measurements of time intervals from inoculation to onset of illness and from inoculation to death. Both intervals were found to be inversely proportional to the size of the dose injected intracerebrally into random-bred weanling Syrian hamsters. The logarithms of the time intervals minus a time factor were linear functions of the logarithm of the inoculum size. The time factors were determined by regression analysis in order to maximize these linear relationships. An equation relating the titer of the inoculum to the dilution of the sample and the length of the time intervals was developed. This equation facilitates the use of a computerized data base. Validation of these relationships was provided by comparing samples for which the agent was measured both by end-point titration and by time interval assay. Agreement between the two methods was generally within +/-0.5 log10 median infective dose units. No differences between the molecular properties of the agents from hamster and murine sources were observed using primarily the incubation time interval method with the former and end-point titration with the latter. The advantages of this new approach based on time interval measurements are considerable with respect to time and resources.

journal_name

Ann Neurol

journal_title

Annals of neurology

authors

Prusiner SB,Cochran SP,Groth DF,Downey DE,Bowman KA,Martinez HM

doi

10.1002/ana.410110406

subject

Has Abstract

pub_date

1982-04-01 00:00:00

pages

353-8

issue

4

eissn

0364-5134

issn

1531-8249

journal_volume

11

pub_type

杂志文章
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    pub_type: 临床试验,杂志文章,多中心研究,随机对照试验

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