PORTLAND, Ore. -- Kaiser Permanente warned some flu shot recipients a batch may have gone bad during shipping.

Spokesman Dave Northfield said the batch of Fluvirin likely got too cold during shipping, discoloring a temperature-sensitive strip. The 35,000 vaccine doses weren't a health risk, they may not be effective.

There was no indication of any health hazard for those who got the shots.

Kaiser was checking with the manufacturer to determine if the vaccines were ineffective and if anyone in Portland and Vancouver would be able to get a second dose.

CDC guidelines indicated revaccination would be safe if it was determined the shots were ineffective.

The company said no more bad batches were going out.

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