Underneath you can find some websites that contain useful information about immunisation :

• Centers for Disease Control and Prevention (CDC)
  
• Vaccine Resources (PATH)
• Global Alliance for Vaccines and Immunization (GAVI)
• Immunization Training Partnership
• International Vaccine Institute (IVI)
• United Nations Children’s Fund (UNICEF)
• University of Southern Africa (MEDUNSA)
• Vaccine Fund
• Viral Hepatitis Prevention Board (VHPB)
• World Health Organization (WHO)
• WHO Regional Office for Africa (WHO/AFRO)
• WHO Regional Office for the Eastern Mediterranean (WHO/EMRO)
• South African Vaccination and Immunisation Centre (SAVIC)
• WHO/ICO Information Center on HPV and Cervical Cancer