Table 2.

Microscopic blood analysis using night thick blood smears, in the districts of urban Belém, Northern region of Brazil, 1990–2004

Local	Year	Number of individuals examined	Number of microfilaremics (%)	Reference
Greater Belém	1990-1994	1,062,945	180 (0.017)	[17]
6 Districts	1995	226,796	6 (0.002)	[17]
5 Districts	1996	93,498	15 (0.016)	[17]
4 Districts	1997	133,198	6 (0.004)	[17]
5 Districts	1998	115,279	1 (0.0008)	[17]
7 Districts	1999	152,255	0 (0.0)	[17]
6 Districts	2000	132,388	0 (0.0)	[17]
15 Districts	2001	99,093	1 (0.001)*	[17]
21 Districts	2002	92,463	0 (0.0)	[17]
12 Districts	2003	71,555	0 (0.0)	[17]
31 historically endemic districts	2004	164,018	0 (0.0)	[18]

* Case of a migrant from a historically endemic area.