1,700 H1N1 vaccine doses freeze en route to North Dakota
North Dakota health officials are investigating how 1,700 doses of H1N1 vaccine froze while they were shipped to locations statewide last week, rendering them ineffective.
The state Health Department notified health providers of the problem on Monday and recommended that the 150 people who received the frozen vaccine be revaccinated because it might not protect them against the H1N1 virus, better known as swine flu.
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