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Rates of pertussis (whooping cough) dropped dramatically in the 20th century after introduction of the pertussis vaccine. Recently however, pertussis cases are on the rise, particularly in California and Texas. In 2014, pertussis was reconsidered an epidemic in California.
California is a hotspot for the anti-vaccine movement, hence the sudden rise.
That is a remarkable leap in preventable illness for an industrialized region. When autism is seen as a preventable condition (not getting vaccinated), it seems that many decide to run certain other risks.