Infection with chikungunya virus in Italy: an outbreak in a temperate region - Rezza, G; Nicoletti, L; Angelini, R; Romi, R; Finarelli, A C; Panning, M; Cordioli, P; Fortuna, C; Boros, S; Magurano, F; Silvi, G; Angelini, P; Dottori, M; Ciufolini, M G; Majori, G C; Cassone, A (Lancet, 2007)