Pathogenesis and histopathology of pertussis: implications for immunization

Area of Science:

• Infectious Diseases
• Pediatric Medicine
• Pathology

Background:

• Pertussis (whooping cough) is a severe, potentially fatal infectious disease, particularly in infants.
• Unlike many infections, pertussis often presents without fever or clear signs of inflammation.
• Understanding the pathology of fatal pertussis is crucial for developing effective treatments and control strategies.

Purpose of the Study:

• To investigate the histopathology of fatal pertussis cases.
• To characterize the unique features of severe pertussis in young infants.
• To identify key virulence factors of Bordetella pertussis contributing to clinical illness.

Main Methods:

• Review of histopathologic findings from approximately 100 years of fatal pertussis cases.
• Evaluation of recent histopathologic data from severe infant pertussis.
• Analysis of Bordetella pertussis antigens implicated in disease pathogenesis.

Main Results:

• Histopathologic examination of the upper respiratory tract in fatal pertussis cases revealed largely normal findings, except in instances of secondary bacterial infection.
• Bordetella pertussis possesses multiple antigens; however, pertussis toxin and an unidentified 'cough toxin' are primarily responsible for clinical manifestations.
• Severe pertussis in infants exhibits unique characteristics that warrant further investigation.

Conclusions:

• The pathogenesis of severe pertussis may not involve a generalized inflammatory response, suggesting a targeted mechanism of action by specific toxins.
• The identification and characterization of the 'cough toxin' are critical for understanding pertussis and developing novel therapeutic interventions.
• Future control of pertussis may rely on strategies targeting these key toxins.