A school district in Pennsylvania's Pocono Mountains must discard 6,000 doses of swine flu vaccine because they got too cold.

The Stroudsburg Area School District must dispose of the doses after discovering the refrigeration units holding the vaccine were 4 degrees below the permitted range.

Health department officials told the district to get rid of the vaccine on Monday. Department spokeswoman Stacy Kriedeman says the vaccine isn't viable if it's not kept at the proper temperature.

Health officials say the vaccine must be stored at a temperature between 35 and 46 degrees. The nursing office refrigerators holding Stroudsburg's doses were kept at 31 degrees.

Kriedeman says the health department will try to replace the doses as more vaccine becomes available.

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