Whooping cough had been believed by public health officials to be a thing of the past in the United States , since for decades almost all children have been vacinated, just as they receive vaccinations for measles, diphtheria, etc. Prior to use of the vaccine the US had more than 175,000 cases per year in the 1940's. By 1970, that figure had dropped to 5,000. By the 1980's the average was 2,900 cases a year or less than 1 per every 100,000 people. Unfortunately, that rate has climbed since the 90's. By 2004, we had nearly 26,000 cases, still small based on a per capita basis but a troubling statistic nonetheless.
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