That means there is a 1:604,822 chance of any random baby dying with pertussis.
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Yes, because almost everybody is vaccinated.
series of five doses is recommended, starting at 6 weeks of age, with the final dose given between 4 and 6 years of age.
So the children are mostly vaccinated and everybody around them is also vaccinated.
Before the pertussis vaccine was widely available in the 1940s, an estimated 9,000 children died annually in the U.S. and worldwide, there were about 160,700 deaths annually in children under 5. Pertussis was a major cause of childhood mortality in the pre-vaccine era.
In 1925 there were less then 3 million children born. So about 0.3% children died from pertussis. That’s significant, especially that there were all the other contagious diseases around.
My mother remembered school friends who died of diphtheria and others from tetanus. I remember bunch of Polio survivors, in wheelchairs or crutches.