Vax objectors linked to pertussis outbreaks

Areas rife with anti-vaccination sentiment can fuel the spread of pertussis during outbreaks, a study shows for the first time.

The investigation into California's 2010 outbreak, the state's most severe in more than 60 years, shows a direct overlap between the geographical distribution of conscientious objectors and the spread of pertussis.

After painstakingly mapping the two, researchers concluded that clusters with high conscientious objection rates were 2.5

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