Effect of an intervention in storm drains to prevent Aedes aegypti reproduction in Salvador, Brazil

Parasites & Vectors

Table 1 Findings from entomological surveys performed in 52 storm drains, before and after an intervention to prevent water accumulation in Salvador, Brazil

Survey characteristics	Pre-intervention (Year: 2015)			Post-intervention (Year: 2016)			P ^a
	First survey	Second survey	Total	First survey	Second survey	Total	P ^a
Survey date (day/month)	10 & 13/Mar	28 & 29/Mar	Mar	21/Apr	21/May	Apr-May
Average precipitation (mm) during 7 days prior to survey	2.7	60.3	31.5	23.2	66.4	44.8	< 0.001
No. (%) of storm drain with accumulated water	38 (73.1)	48 (92.3)	48 (92.3)	2 (3.9)	4 (7.7)	5 (9.6)	< 0.001
Average volume (l) of water	32.2	51.0	41.6	0.45	2.7	1.6	0.043
No. (%) of storm drain containing larvae/pupae of
Aedes aegypti	11 (21.2)	1 (1.9)	11 (21.2)	0 (0)	0 (0)	0 (0)	< 0.001
Non-Aedes mosquitoes	19 (36.5)	2 (3.8)	19 (36.5)	0 (0)	1 (1.9)	1 (1.9)	< 0.001
No. (%) of storm drain containing adults of
Aedes aegypti	8 (15.4)	2 (3.8)	10 (19.2)	3 (5.8)	0 (0)	3 (5.8)	0.039
Aedes albopictus	0 (0)	0 (0)	0 (0)	1 (1.9)	0 (0)	1 (1.9)	1.00
Non-Aedes mosquitoes	12 (23.1)	8 (15.4)	13 (25.0)	2 (3.8)	0 (0)	2 (3.8)	< 0.001
Number of larvae/pupae collected
Aedes aegypti	108	1	109	0	0	0	< 0.001
Non-Aedes mosquitoes	161	6	167	0	42	42	< 0.001
Number of adults captured
Aedes aegypti	35	2	37	8	0	8	0.011
Aedes albopictus	0	0	0	1	0	1	0.317
Non-Aedes mosquitoes	16	25	41	4	0	4	< 0.001

Aedes albopictus larvae or pupae were not detected in any of the surveys. Non-Aedes mosquitoes were mainly Culex spp. mosquitoes
^a P-values for the comparison between pre- and post-intervention totals using MacNemar’s test or Wilcoxon signed-rank test

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