[Varicella and herpes zoster incidence prior to the introduction of systematic child vaccination in Navarre, 2005-2006]. / Incidencia de la varicela y el herpes zóster antes de la introducción de la vacunación sistemática infantil en Navarra, 2005-2006.

Varicella is an acute and highly contagious disease produced by the varicella-zoster virus, which leaves lasting immunity. Herpes zoster is produced by reactivation of a latent infection of the same virus. The introduction of systematic and free vaccination against varicella in children of 15 months in Navarre from 2007 onwards can be expected to produce important epidemiological changes. For this reason we describe the previous epidemiological situation in the period from 2005 to 2006. We analysed all cases of varicella and herpes zoster registered in the electronic clinical files of primary care, in the database of hospital discharges and in the mortality register. Between 2005 and 2006, 9,908 cases of varicella were diagnosed (8.29 annually per 1,000 inhabitants), with 90% in children under 15 years old. There were 80 hospital admissions (8 for every 1,000 cases), complications in 2.5 out of every 1,000 cases, and there was one death due to this cause (0.1 per 1,000 cases). In the same period, 4,959 cases of herpes zoster were diagnosed (4.15 cases per 1,000 inhabitants), half in people over 55 years old. There were 179 hospital admissions (36 per 1,000 cases), whose average age was 77, and 83 presented complications (16.7 per 1,000 cases). This epidemiological pattern is similar to that found in other places before the introduction of the vaccine.

Incidencia de la varicela y el herpes zóster antes de la introducción de la vacunación sistemática infantil en Navarra, 2005-2006 / Varicella and herpes zoster incidence prior to the introduction of systematic child vaccination in Navarre, 2005-2006

La varicela es una enfermedad aguda muy contagiosa producida por el virus varicela-zoster, que deja inmunidad duradera. El herpes zóster se produce por reactivación de una infección latente por el mismo virus. La introducción de la vacunación sistemática y gratuita frente a la varicela en niños de 15 meses de Navarra desde 2007, previsiblemente producirá cambios epidemiológicos importantes. Por ello, describimos la situación epidemiológica previa, en el periodo 2005-2006.Se han analizado los casos de varicela y herpes zóster registrados en las historias clínicas informatizadas de atención primaria, en la base de datos de altas hospitalarias (CMBD) y en el registro de mortalidad. Entre 2005 y 2006 se diagnosticaron 9908 casos de varicela (8,29 anuales por 1000 habitantes), siendo el 90% en menores de 15 años. Hubo 80 ingresos (8 por cada 1000 casos), complicaciones en 2,5 de cada 1.000 casos y se produjo un fallecimiento por esta causa (0,1 por 1000 casos). En el mismo periodo se diagnosticaron 4.959 casos de herpes zóster (4,15 casos anuales por 1.000 habitantes), la mitad en mayores de 55 años. Hubo 179 ingresos (36 por 1.000 casos), cuya edad media fue de77 años, y 83 presentaron complicaciones (16,7 por 1.000 casos). Este patrón epidemiológico es similar al encontrado en otros lugares antes de la introducción de la vacuna (AU)

Varicella is an acute and highly contagious disease produced by the varicella-zoster virus, which leaves lasting immunity. Herpes zoster is produced by reactivation of a latent infection of the same virus. The introduction of systematic and free vaccination against varicella in children of 15 months in Navarre from 2007 onwards can be expected to produce important epidemiological changes. For this reason we describe the previous epidemiological situation in the period from 2005 to 2006.We analysed all cases of varicella and herpes zoster registered in the electronic clinical files of primary care, in the database of hospital discharges and in the mortality register. Between 2005 and 2006, 9,908 cases of varicella were diagnosed (8.29 annually per 1,000 in habitants), with 90% in children under 15 years old. There were 80 hospital admissions (8 for every 1,000 cases), complications in 2.5 out of every 1,000 cases, and there was one death due to this cause (0.1 per 1,000 cases). In the same period, 4,959 cases of herpes zoster were diagnosed (4.15 cases per 1,000 in habitants), half in people over 55 years old. There were 179 hospital admissions (36 per 1,000 cases), whose average age was 77, and 83 presented complications (16.7 per 1,000 cases).This epidemiological pattern is similar to that found in other places before the introduction of the vaccine (AU)

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