Table 2. Chagas disease vector ‘detection histories’ in 414 man-made ecotopes of the lower Jaguaribe valley in northeastern Brazil across three vector-search rounds: code, interpretation, and individual history frequencies.

Vector-search round			Interpretation	Frequency
Search 1	Search 2	Search 3
0	0	0	No detection after three search rounds	317
0	0	2	Vectors/exuviae detected only in search 3	7
0	1	0	Only fecal streaks detected only in search 2	3
0	2	0	Vectors/exuviae detected only in search 2	7
0	2	2	Vectors/exuviae detected in searches 2 and 3	2
1	0	0	Only fecal streaks detected only in search 1	5
1	0	2	Only fecal streaks detected in search 1; vectors/exuviae detected in search 3	1
1	1	0	Only fecal streaks detected in searches 1 and 2	2
1	2	0	Only fecal streaks detected in search 1; vectors/exuviae detected in search 2	2
1	2	2	Only fecal streaks detected in search 1; vectors/exuviae detected in searches 2 and 3	1
2	0	0	Vectors/exuviae detected only in search 1	16
2	0	2	Vectors/exuviae detected in searches 1 and 3	7
2	1	0	Only fecal streaks detected in search 2; vectors/exuviae detected in search 1	6
2	1	1	Only fecal streaks detected in searches 2 and 3; vectors/exuviae detected in search 1	1
2	1	2	Only fecal streaks detected in search 2; vectors/exuviae detected in searches 1 and 3	4
2	2	0	Vectors/exuviae detected in searches 1 and 2	9
2	2	1	Only fecal streaks detected in search 3; vectors/exuviae detected in searches 1 and 2	2
2	2	2	Vectors/exuviae detected in searches 1 to 3	22

Results in the first three columns are coded as follows: 0 =  non-detection, 1 =  detection of only fecal streaks suggestive of triatomine bug presence, and 2 =  detection of at least one triatomine bug (any stage) or exuvia (molted ‘skin’) that could be identified without doubt.