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A new government report obtained exclusively by ABC News has parents worried about the efficacy of immunizations for their children.

An investigation by the Department of Health and Human Services' Office of the Inspector General (HHS OIG) found that many providers of immunizations meant for low-income children don't store the vaccines at proper temperatures, potentially rendering them ineffective and placing children at risk for contracting serious diseases.

More: Read the full storyto learn more and find out what parents can do to ensure their chidren's vaccines are effective.

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