Why whooping cough outbreaks in the U.S. have a Canadian doctor on edge CTV NewsThis dangerous cough threat is already surging ahead of winter AxiosPertussis in the US: Cases down 20% in first 10 months Outbreak News TodayWhat is whooping cough? How to protect your family from the deadly infection The IndependentWhooping cough warning: Doctor wants parents to know the causes and symptoms to protect their kids The Times of India
