What did Jules Bordet Discover 1919?
Jules Bordet was awarded the 1919 Nobel Prize in Physiology or Medicine “for his discoveries relating to immunity,” including the discovery of complement, the development of complement fixation tests, and the identification of the bacterium that causes whooping cough.
Is whooping cough gram positive or negative?
Bordetella pertussis is a small (approximately 0.8 μm by 0.4 μm), rod-shaped, coccoid, or ovoid Gram-negative bacterium that is encapsulated and does not produce spores.
How was whooping cough isolated?
Isolation of B. pertussis. In Paris in 1900, Jules Bordet and Octave Gengou identified the causative agent of whooping cough. They identified “a small ovoid Gram-negative bacterium” in an expectorate fluid specimen obtained from a 5-month-old child.
How did Karl Landsteiner change the world?
In 1930, Landsteiner was awarded the Nobel Prize for his description of the human ABO blood group system, which he himself considered an accidental discovery. Karl Landsteiner discovered human blood groups in 1900 and laid the foundation for the modern medical practice of blood transfusion.
What did Karl Landsteiner discover?
Karl Landsteiner discovered why: when different people’s blood was mixed, the red blood cells sometimes clumped. He explained in 1901 that people have different types of red blood cells, that is, there are different blood groups. The discovery led to safe blood transfusions between people with compatible blood groups.
What is the pathogenesis of Bordetella pertussis?
Pathogenesis. B. pertussis infection and disease occur after four important steps: (1) attachment, (2) evasion of host defenses, (3) local damage, and (4) systemic manifestations. Filamentous hemagglutinin (FHA) and fimbriae (FIM) are two major adhesins and virulence determinants forB.
What type of organism is Bordetella pertussis?
Pertussis, a respiratory illness commonly known as whooping cough, is a very contagious disease caused by a type of bacteria called Bordetella pertussis. These bacteria attach to the cilia (tiny, hair-like extensions) that line part of the upper respiratory system.
What is the pathogenesis of whooping cough?
Pertussis (whooping cough) is caused by acute respiratory infection with the bacterial pathogen Bordetella pertussis. Several countries are experiencing significantly increased numbers of pertussis cases in recent years [1], including the United States where the number of reported cases in 2012 was a 50-year high [2].
What is the major contribution of Karl Landsteiner?
Which important discovery was Karl Landsteiner awarded the Nobel Prize in Physiology 1930?
discovery of human blood groups
The Nobel Prize in Physiology or Medicine 1930 was awarded to Karl Landsteiner “for his discovery of human blood groups.”
What is Karl Landsteiner known for?
What is the mechanism of action of pertussis whooping cough?
Pertussis toxin (PT) utilizes a retrograde transport pathway through the Golgi complex and endoplasmic reticulum (ER) to gain entry to the cell cytosol. ATP binding to PT B oligomer (PTB) in the ER promotes holotoxin dissociation for further transport of the active subunit.
What is the mechanism of action of pertussis whooping cough )?
Effects on the immune system It inhibits the early recruitment of neutrophils and macrophages, and interferes with the early chemokine production and the inhibition of the neutrophil chemotaxis. Chemokines are signaling molecules produced by infected cells and attract neutrophils and macrophages.
What is the characteristics of Bordetella pertussis?
CHARACTERISTICS: Bordetella pertussis are small, gram-negative, encapsulated, non-motile, coccobacilli with outer pili. They are generally about 0.5-1.0 µm in size 3- 5. Some have reported that the bacteria are covered with surface slime or biofilm composed of carbohydrates 6 .
What causes whooping cough?