PBS: "Most of the people who got whooping cough in San Diego Co. so far this year were up to date with their immunizations..."
@ElaineReplogle Accding to scientists i've spoken to over the yrs & the article addresses this, some vaccines grow less effective over time
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@SharylAttkisson Yes, have heard same. Had to be revaccinated for pertussis a few years ago. Many people don't realize they should.Thanks. Twitter will use this to make your timeline better. UndoUndo
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