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SEATTLE, July 20 — The number of US whooping cough cases has risen to around 18,000 in an outbreak that is on track to become the most severe in over a half century and could in part stem from possible waning vaccine protection, health officials said yesterday.Washington state, which declared an epidemic in April, and Wisconsin were particularly ... Read more at http://www.themalaysianinsider.com/world/article/us-whooping-cough-outbreak-could-be-worst-in-half-century/