These aerobic, gram-negative bacteria produce tracheal cytotoxin that kills ciliated cells of the trachea.

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Identify the key characteristics given in the problem: the bacteria are aerobic, gram-negative, and produce tracheal cytotoxin that damages ciliated cells of the trachea.

Recall that tracheal cytotoxin is a specific virulence factor known to be produced by certain bacteria that affect the respiratory tract, particularly targeting ciliated epithelial cells.

Consider common aerobic, gram-negative bacteria associated with respiratory infections and known for producing tracheal cytotoxin; this narrows down the possibilities.

Use your knowledge of microbiology to link the production of tracheal cytotoxin with the bacterium Bordetella pertussis, which is the causative agent of whooping cough and is known for this toxin.

Conclude that the bacterium described is Bordetella pertussis based on the combination of aerobic metabolism, gram-negative staining, and production of tracheal cytotoxin.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Aerobic Gram-negative Bacteria

These bacteria require oxygen for growth and have a cell wall structure characterized by a thin peptidoglycan layer and an outer membrane containing lipopolysaccharides. Their Gram-negative nature affects staining properties and antibiotic susceptibility, important for identification and treatment.

Tracheal Cytotoxin

Tracheal cytotoxin is a bacterial toxin that specifically damages ciliated epithelial cells in the respiratory tract. By killing these cells, it impairs mucociliary clearance, leading to respiratory symptoms and facilitating bacterial colonization.

Ciliated Cells of the Trachea

Ciliated cells line the trachea and help move mucus and trapped particles out of the respiratory tract. Damage to these cells by toxins disrupts this defense mechanism, increasing vulnerability to infections and respiratory complications.

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