Pertussis (Whooping Cough) is a highly contagious, acute respiratory disease caused by the bacterium Bordetella pertussis. It is primarily a toxin-mediated disease where bacteria attach to respiratory cilia, paralyzing them and causing inflammation that hinders the clearing of secretions. While it affects all ages, it is most dangerous for infants, potentially leading to apnea (pauses in breathing), pneumonia, and death.

The Three Clinical Stages

The hallmark of Pertussis is its progression through three distinct stages over several weeks or months:

• 1. Catarrhal Stage (1–2 weeks): This is the most infectious phase. Symptoms resemble a common cold—runny nose, low-grade fever, and mild cough. Because symptoms are nonspecific, diagnosis is often missed here, facilitating ...