Whooping cough, a deadly respiratory illness that was once on the wane, is making a comeback in Canada. Read Andre Picard’s comment piece on the importance of universal vaccinations and ‘herd immunity’. When everyone is vaccinated the most vulnerable of the population – infants under 2 months of age who are too young to be vaccinated, the elderly and the very ill – are kept safe from circulating bacteria. Learn more about immunizations for your baby.