Fil: García, Salvador. Pan American Health Organization, Washington DC; Estados Unidos.Fil: Lagos, Rosanna. Centro para Vacunas en Desarrollo (CVD-Chile), Santiago; Chile.Fil: Muñoz, Alma. Centro para Vacunas en Desarrollo (CVD-Chile), Santiago; Chile.Fil: Picón, Teresa. National Immunization Program and Department of Epidemiologic Surveillance, Ministry of Health, Montevideo; Uruguay.Fil: Rosa, Raquel. National Immunization Program and Department of Epidemiologic Surveillance, Ministry of Health, Montevideo; Uruguay.Fil: Alfonso, Adriana. National Immunization Program and Department of Epidemiologic Surveillance, Ministry of Health, Montevideo; Uruguay.Fil: Abriata, Graciela. Instituto Nacional del Cáncer, Ministerio de Salud de la Nación, Buenos Aires; Argentina.Fil: Gentile, Angela. Hospital de Niños Ricardo Gutierrez, Epidemiología, Buenos Aires; Argentina.Fil: Romanin, Viviana. Hospital de Niños Ricardo Gutierrez, Epidemiología, Buenos Aires; Argentina.Fil: Regueira, Mabel. ANLIS Dr.C.G.Malbrán. Instituto Nacional de Enfermedades Infecciosas; Argentina.Fil: Chiavetta, Laura. ANLIS Dr.C.G.Malbrán. Instituto Nacional de Enfermedades Infecciosas; Argentina.Fil: Agudelo, Clara Inés. Instituto Nacional de Salud, Bogotá; Colombia.Fil: Castañeda, Elizabeth. Instituto Nacional de Salud, Bogotá; Colombia.Fil: De la Hoz, Fernando. Facultad de Medicina, Departamento de Salud Pública, Universidad Nacional de Colombia, Bogotá; Colombia.Fil: Higuera, Ana Betty. Secretaria de Salud de Bogotá, Bogotá; Colombia.Fil: Arce, Patricia. Secretaria de Salud de Bogotá, Bogotá; Colombia.Fil: Cohen, Adam L.. National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA; Estados Unidos.Fil: Verani, Jennifer. National Center for Immunization and Respiratory Diseases, Centers for Disease Control and Prevention, Atlanta, GA; Estados Unidos.Fil: Zuber, Patrick. Department of Immunization, Vaccines and Biologicals, World Health Organization, Geneva; Suiza.Fil: Gabastou, Jean-Marc. Pan American Health Organization, Washington DC; Estados Unidos.Fil: Pastor, Desiree. Pan American Health Organization, Washington DC; Estados Unidos.Fil: Flannery, Brendan. Pan American Health Organization, Washington DC; Estados Unidos.Fil: Andrus, Jon. Pan American Health Organization, Washington DC; Estados Unidos.To inform World Health Organization recommendations regarding use of Haemophilus influenzae type b (Hib) vaccines in national immunization programs, a multi-country evaluation of trends in Hib meningitis incidence and prevalence of nasopharyngeal Hib carriage was conducted in four South American countries using either a primary, three-dose immunization schedule without a booster dose or with a booster dose in the second year of life. Surveillance data suggest that high coverage of Hib conjugate vaccine sustained low incidence of Hib meningitis and low prevalence of Hib carriage whether or not a booster dose was used
