The impact of this increase on the clinical-epidemiological data is difficult to demonstrate; however, at a national level the incidence rate showed a decreasing trend in elderly, in particular during the 2000–2001 season, when H1N1 virus spread.
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Surveillance of influenza in Apulia, Italy, 1999-2000, 2000-2001, 2001-2002, and 2002-2003 seasons.
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