Table 1.

Features of surveillance in the two surveyed regions.

	Emilia-Romagna	Lombardy
Number of seasonal traps	95	39
Number of extra traps	9	23
Maximum number of mosquitoes per pool	200	100
Maximum number of mosquitoes tested per sampling	all sampled	1000
Start date	June 12	June 4
End date	October 16	October 25