Reference:
1. National Immunization Program (NIP), Center for Disease Control and Prevention. Vaccine management : recommendations for handling and storage of selected biological, 2001.
2. World Health Organization (WHO). WHO Policy statement , the use of opened multi-dose vial of vaccine in subsequent , immunization sessions, 2000.
3. County of Los Angeles department of health service (Public Health). Vaccine Storage and handling the importance of proper vaccine storage. Immunization Exchange (newsletters), second quarter, 1999.
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