What is whooping cough? (Introduction)

Whooping cough - pertussis - is a highly contagious bacterial infection of the airways, named for the characteristic 'whoop' sound as a child gasps for breath after a bout of coughing. It is caused by the bacterium Bordetella pertussis and spreads through droplets when an infected person coughs or sneezes.

The illness is deceptive: it begins like an ordinary cold - runny nose, mild cough - then escalates over one to two weeks into severe, uncontrollable coughing fits. Many rapid coughs in a single breath, followed by the whooping intake of air, often ending in vomiting or exhaustion. These fits can continue for weeks to months, earning it the name '100-day cough'.

The group that matters most is infants. Babies under six months - too young to be fully vaccinated - face the gravest risk: their coughing fits can end in pauses in breathing (apnoea), and they may never whoop at all. Pertussis in young infants is a hospital-level illness, and it is the main reason vaccination strategy in pregnancy and early infancy exists. Infants usually catch it from an older sibling or adult whose immunity has faded and who seems to have 'just a cough'.

Protection is vaccination. In India's Universal Immunisation Programme, the pentavalent vaccine (which includes pertussis) is given at 6, 10 and 14 weeks with boosters in the second year and at 5-6 years. Immunity fades over years, so adolescents and adults can carry and spread the infection - which is why pregnant women are advised a Tdap dose in each pregnancy to pass protection to the newborn.

Ayurvedic view (interpretive): classical texts describe violent paroxysmal cough patterns within an interpretive framework of limited evidence. Pertussis is a vaccine-preventable bacterial infection - modern prevention and care are primary.

Remember: a cold that becomes weeks of violent coughing fits - especially with a whoop, vomiting after coughing, or any breathing pause in a baby - is whooping cough until proven otherwise. Infants are the lives at stake; vaccination is the shield.