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Average incidence rate (no. of cases/100 000 inhabitants) of brucellosis in the Italian provinces during the four sub-periods from 1998 to 2010. (a) 1998–200, (b) 2001–2003, (c) 2004–2006, (d) 2007–2010. Data from the National Surveillance System of Infectious Diseases (SIMI).
