Pathogenicity and virulence of Bordetella pertussis and its adaptation to its strictly human host

Area of Science:

• Microbiology
• Evolutionary Biology
• Immunology

Background:

• Bordetella pertussis is a highly contagious human pathogen responsible for whooping cough.
• It evolved from a progenitor species that also gave rise to Bordetella parapertussis and Bordetella bronchiseptica.
• Unlike its relatives, B. pertussis has lost environmental survival capabilities due to genome decay.

Purpose of the Study:

• To review the evolutionary adaptation mechanisms of Bordetella pertussis to the human respiratory tract.
• To illustrate how B. pertussis overcomes host innate and vaccine-induced adaptive immunity.
• To provide evidence of ongoing evolutionary adaptation in this successful human pathogen.

Main Methods:

• Review of in vitro studies.
• Analysis of data from human clinical cases.
• Examination of findings from animal models of pertussis.

Main Results:

• B. pertussis has acquired sophisticated virulence factors and adapted its metabolism for human colonization.
• The pathogen effectively evades innate immune defenses.
• Mechanisms interfering with vaccine-induced adaptive immunity have been identified.

Conclusions:

• Bordetella pertussis demonstrates remarkable evolutionary adaptation to thrive as a human-specific pathogen.
• Its success is attributed to genome decay, virulence factor acquisition, and immune evasion strategies.
• Ongoing evolution suggests continued adaptation to the human host and vaccination pressures.