The tempting conclusion is that pertussis is making its way back into the population due largely to vaccine refusal and anti-vaccine propaganda. However, there is yet no data to support that conclusion. It may or may not be the case – we will know once a more thorough analysis is done of the individual cases of pertussis. And in any case, there are many factors at work.
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First, pertussis has a natural tendency to cycle every 5 years or so, and this year is the peak of the cycle. This is certainly a significant part of the increase this year, regardless of other contributors.
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