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Active: Antigen is introduced so that the individual's immune system is stimulated to make the appropriate antibodies.
Passive: Preformed protective antibodies are transferred.
- Children 12 months to 12 years old (routinely at 12 to 18 months of age)
- Adolescents and adults without history of chickenpox, especially:
• Health care workers
• Day care workers
• College students
• Military personnel
• Nonpregnant women of childbearing age
• International travelers
• Family contacts of immunocompromised patients