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STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY

On the basis of earlier observations dealing with the relation of a petroleum ether-soluble material (cord factor) obtained from young cultures of virulent tubercle bacilli to the pathogenicity of these organisms, it was expected that young cultures yielding more cord factor than older ones of the s...

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Autor principal: Bloch, Hubert
Formato: Texto
Lenguaje:English
Publicado: The Rockefeller University Press 1950
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2135997/
https://www.ncbi.nlm.nih.gov/pubmed/14784534
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author Bloch, Hubert
author_facet Bloch, Hubert
author_sort Bloch, Hubert
collection PubMed
description On the basis of earlier observations dealing with the relation of a petroleum ether-soluble material (cord factor) obtained from young cultures of virulent tubercle bacilli to the pathogenicity of these organisms, it was expected that young cultures yielding more cord factor than older ones of the same strain would also be more virulent for susceptible animals. By infecting mice with equal numbers of bacteria from 3 day and 3 week old cultures, significant differences in the character of disease produced were observed. The mice infected with the younger cultures died of a rapid, septicemic infection with tuberculous lesions in many organs including the heart. A tuberculous myocarditis was probably the immediate cause of death. Mice infected with the older bacteria died of a chronic disease corresponding to the well known mouse tuberculosis. In these cases, the heart was completely free of lesions. No histologic tissue reactions typical of tuberculosis were seen in the animals dying from the acute type of the disease. A similar rapidly progressing infection was observed in rabbits infected with bacteria from young cultures. The symptoms corresponded to the ones seen in the disease known as the Yersin type of tuberculosis. It seems that the pathology of this latter can be produced with every type of pathogenic mycobacteria, human as well as bovine and avian, provided the cultures used are young. Thus it may be inferred that the acute type of tuberculosis is more frequent than commonly accepted both in experimental infection and in the naturally occurring disease. It is proposed to explain the mechanism of this acute infection within the framework of the cord factor hypothesis.
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spelling pubmed-21359972008-04-17 STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY Bloch, Hubert J Exp Med Article On the basis of earlier observations dealing with the relation of a petroleum ether-soluble material (cord factor) obtained from young cultures of virulent tubercle bacilli to the pathogenicity of these organisms, it was expected that young cultures yielding more cord factor than older ones of the same strain would also be more virulent for susceptible animals. By infecting mice with equal numbers of bacteria from 3 day and 3 week old cultures, significant differences in the character of disease produced were observed. The mice infected with the younger cultures died of a rapid, septicemic infection with tuberculous lesions in many organs including the heart. A tuberculous myocarditis was probably the immediate cause of death. Mice infected with the older bacteria died of a chronic disease corresponding to the well known mouse tuberculosis. In these cases, the heart was completely free of lesions. No histologic tissue reactions typical of tuberculosis were seen in the animals dying from the acute type of the disease. A similar rapidly progressing infection was observed in rabbits infected with bacteria from young cultures. The symptoms corresponded to the ones seen in the disease known as the Yersin type of tuberculosis. It seems that the pathology of this latter can be produced with every type of pathogenic mycobacteria, human as well as bovine and avian, provided the cultures used are young. Thus it may be inferred that the acute type of tuberculosis is more frequent than commonly accepted both in experimental infection and in the naturally occurring disease. It is proposed to explain the mechanism of this acute infection within the framework of the cord factor hypothesis. The Rockefeller University Press 1950-11-30 /pmc/articles/PMC2135997/ /pubmed/14784534 Text en Copyright © Copyright, 1950, by The Rockefeller Institute for Medical Research New York This article is distributed under the terms of an Attribution–Noncommercial–Share Alike–No Mirror Sites license for the first six months after the publication date (see http://www.rupress.org/terms). After six months it is available under a Creative Commons License (Attribution–Noncommercial–Share Alike 4.0 Unported license, as described at http://creativecommons.org/licenses/by-nc-sa/4.0/).
spellingShingle Article
Bloch, Hubert
STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY
title STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY
title_full STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY
title_fullStr STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY
title_full_unstemmed STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY
title_short STUDIES ON THE VIRULENCE OF TUBERCLE BACILLI : THE RELATIONSHIP OF THE PHYSIOLOGICAL STATE OF THE ORGANISMS TO THEIR PATHOGENICITY
title_sort studies on the virulence of tubercle bacilli : the relationship of the physiological state of the organisms to their pathogenicity
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2135997/
https://www.ncbi.nlm.nih.gov/pubmed/14784534
work_keys_str_mv AT blochhubert studiesonthevirulenceoftuberclebacillitherelationshipofthephysiologicalstateoftheorganismstotheirpathogenicity