"Health & Medical News"

Washington — A postmortem of a mumps outbreak in 2006 — the nation’s largest in 20 years — is raising questions about the effectiveness of the vaccine.

Investigators who took a close look at the reasons behind the 6,584 cases of mumps that hit Midwestern states in March through May of 2006 found that a surprisingly large percentage of those who contracted the illness had received the recommended two doses of the measles, mumps and rubella vaccine.

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