A member asked:

What vaccines have been known to cause really harmful side effects?

A doctor has provided 1 answer

67 swine flu vaccine: A vaccine hurriedly issued in ~ 1967 after an outbreak of swine flu at a military facility was associated with a relatively large number of cases of guillian-barre syndrome. The problem was traced back to flaws in vaccine production & lead to more stringent production & quality control standards going forwards.

Answered 2/2/2013

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