Abstract

CASTILLA, J.  and  RED DE MEDICOS CENTINELA et al. The 2009 H1N1 influenza pandemic in Navarre, Spain. Anales Sis San Navarra [online]. 2010, vol.33, n.3, pp.287-295. ISSN 1137-6627.

Background: To describe influenza activity during the 2009-2010 pandemic in Navarre and compare it to previous seasons. Methods: An analysis was made of all influenza-like illness cases reported in primary care and all the virological confirmations made in patients in primary care and in hospitals of Navarre between week 21 of 2009 and week 20 of 2010. Results: Influenza 2009 H1N1 virus was detected in Navarre between week 23 of 2009 and week 2 of 2010, a period when 39 medically diagnosed cases of influenza-like illness per 1,000 inhabitants were registered. The epidemic threshold was surpassed in two periods, with a peak in July and a greater one in November. The greatest incidence was reached in children aged between 5 and 14 years (121 per thousand), followed by the group of under fives. There were 224 hospitalisations (36 per 100,000 inhabitants) with confirmation of influenza 2009 H1N1 virus, 8% of whom required admission to intensive care units and there were four deaths (0.6 per 100,000 inhabitants). The rate of hospitalisation was greater amongst children under five (163 per 100,000 inhabitants), while the probability of referral to intensive care increased with age. Conclusion: In spite of not having a specific vaccine available until the season was very well advanced, influenza 2009 H1N1 virus produced a wave of cases with similar incidence to those of other seasons and its repercussion in hospitalisations and serious cases was moderate.

Keywords : Influenza; Pandemic; Public health; Epidemiological Surveillance.

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