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Diphtheria

Whooping cough still on the rise in Arizona

Cases of whooping cough - an infection that can kill otherwise healthy infants - continued to climb in Arizona this year.

December 28, 2012 12:00 amLoading…

Factors that make for 'herd immunity'

If enough people are vaccinated, an isolated case of infectious disease will not morph into a full-blown outbreak.

May 20, 2012 12:00 amLoading…

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