title: Varicella vaccination programs do not seem to shift the age of disease to older age groups.
abstract: The paper of Baxter et al., recently published in Pediatrics show through five cross-sectional studies, a high impact of vaccination in the decline of varicella incidence and hospitalizations in all age groups in the United States between 1995 and 2009. As a consequence of herd immunity, varicella incidence has also diminished in those non vaccinated, which indicates no shift in the burden of varicella to older age groups.
authors.affiliation: Infectious Diseases Surveillance, Institute of Public Health of Navarra, Pamplona, Spain ; CIBER Epidemiología y Salud Pública (CIBERESP), Spain.
authors.forename: Manuel
authors.initials: M
authors.lastname: García Cenoz
keywords: Varicella; chickenpox; epidemiology; vaccine impact; varicella vaccination
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