PATHOLOGY

Detailed explanation-1: -Symptoms of pertussis start 7 to 10 days after being exposed and vary by age. They usually begin as cold-like symptoms including a runny nose, tearing eyes, fatigue and fever.

Detailed explanation-2: -After an incubation period of 1 to 3 weeks, pertussis infection typically progresses through three distinct stages: the catarrhal phase, the paroxysmal phase, and the convalescent phase.

Detailed explanation-3: -Runny or stuffed-up nose. Low-grade fever (less than 100.4°F) Mild, occasional cough (babies do not do this) Apnea (life-threatening pauses in breathing) and cyanosis (turning blue or purple) in babies and young children.