Question: What does one point on the line show? The number of years pertussis/whooping cough has affected humans The number of individuals that received the pertussis/whooping
What does one point on the line show? The number of years pertussis/whooping cough has affected humans The number of individuals that received the pertussis/whooping cough vaccine in a particular year The number of vaccines given in a particular year The number of individuals that got pertussis/whooping cough in a particular year
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