TY - SER ED - Pan American Health Organisation (PAHO) TI - Immunization newsletter SN - 1814-6244 U1 - 362.1 22 CY - Washington, D.C. PB - Immunization Unit of the Pan American Health O rganization (PAHO) KW - Vaccination of children N1 - Latest issue consulted: Vol. 31 no. 1 (Feb. 2009) ER -