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Related Concept Videos

Pulmonary Tuberculosis IV01:26

Pulmonary Tuberculosis IV

Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
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Tuberculosis (TB) is a contagious infection primarily affecting the lung parenchyma but which can also affect other body parts. TB can be classified based on disease development, presentation, and the affected anatomical site.
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Tuberculosis, often called TB, is a contagious illness primarily caused by Mycobacterium tuberculosis. It mainly affects the lung parenchyma but can also impact other body parts.
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Sputum Studies I: Gram Stain, cytology, and Acid-fast smear and culture01:26

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STUDIES ON COMPLEMENT FIXATION IN TUBERCULOSIS. III.

P A Lewis1

  • 1Department of Animal Pathology of The Rockefeller Institute for Medical Research, Princeton, N. J.

The Journal of Experimental Medicine
|October 30, 2009
PubMed
Summary
This summary is machine-generated.

Researchers developed a potent antigen from tubercle bacilli using boiling ethyl alcohol extraction. This antigen triggers a unique precipitation reaction in normal blood serum, even without specific immunization.

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Area of Science:

  • Immunology
  • Microbiology
  • Biochemistry

Background:

  • The tubercle bacillus is a significant pathogen requiring effective diagnostic tools.
  • Antigens derived from bacteria are crucial for immunological assays like complement fixation.

Purpose of the Study:

  • To develop a highly active antigen from the tubercle bacillus for immunological reactions.
  • To characterize the antigen's reactivity with normal and immunized serum.

Main Methods:

  • Extraction of tubercle bacilli using prolonged boiling ethyl alcohol.
  • Reprecipitation of the antigen by chilling the hot alcoholic solution.
  • Testing antigen activity in complement fixation reactions and precipitation reactions with normal and heat-treated serum.

Main Results:

  • A highly active antigen preparation was successfully obtained from the tubercle bacillus.
  • This antigen induced a precipitation reaction in normal blood serum across multiple species, even at high dilutions.
  • The precipitation reaction exhibited a notable pro-zone phenomenon and required prior heat treatment of the serum.
  • This reaction in normal serum was unaffected by immunization levels that produced moderate specific complement fixation.

Conclusions:

  • The described extraction method yields a potent tubercle bacillus antigen.
  • A novel precipitation reaction involving normal serum, dependent on heat treatment and showing a pro-zone, was identified.
  • This reaction's independence from specific immunization suggests a non-specific interaction or a baseline immune response.