What is the most common complication of pertussis?

Pneumonia is the most common complication of pertussis, also known as whooping cough. It occurs primarily due to the nature of the disease, which significantly affects the respiratory system. As pertussis progresses, the intense cough can lead to complications in the lungs, allowing bacteria to invade and cause pneumonia. This is particularly concerning because pneumonia can exacerbate the symptoms of pertussis and lead to further complications, especially in vulnerable populations like infants and the elderly.

While other complications such as seizures and hypoxemia can occur, pneumonia has been shown through clinical studies to be the most prevalent complication associated with pertussis infection. The severity of pneumonia that may result from pertussis also highlights the need for vaccination, especially in populations at risk, to reduce incidences of both pertussis and its associated complications.