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Volume 19, Number 7—July 2013

Dispatch

Reducing Visceral Leishmaniasis by Insecticide Impregnation of Bed-Nets, Bangladesh

Dinesh MondalComments to Author , M. Mamun Huda, Mithun Kumar Karmoker, Debashis Ghosh, Greg Matlashewski, Shah Golam Nabi, and Axel Kroeger
Author affiliations: International Centre for Diarrhoeal Disease Research, Bangladesh, Dhaka, Bangladesh (D. Mondal, M.M. Huda, M.K. Karmoker, D. Ghosh); World Health Organization, Geneva, Switzerland (G. Matlashewski, A. Kroeger); Directorate General of Health Services of the Government of Bangladesh, Dhaka (S.G. Nabi); Liverpool School of Tropical Medicine, Liverpool, UK (A. Kroeger)

Main Article

Table 1

VL incidence and affected households before and after bed-net impregnation program, Bangladesh, 2006–2010*

Group Bed-net impregnation
Rate changes (p value) % Reduction† compared with control (p value)‡
Before, no. (%) affected After, no. (%) affected
HH§
Intervention, n = 2,512 40 (15.92) 3 (1.19) –14.73 (<0.0001) –70.52% (0.0007)
Control, n = 3,143 21 (6.68) 10 (3.18) –3.50 (0.0476)
Total, n = 5,655
61 (10.79)
13 (2.30)
–8.49 (<0.0001)

Population¶
Intervention, n = 11,426 43 (37.63) 3 (2.63) –35.01(<0.0001) –66.49% (0.001)
Control, n = 14,021 26 (18.54) 12 (8.56) –9.99 (0.023)
Total, n = 25,447 69 (27.12) 15 (5.89) –21.22 (<0.0001)

*VL, visceral leishmaniasis; HH, households.
†Effect of intervention: (B/A) – (D/C) Where A = baseline value for VL-affected HH per 1,000 HH/VL incidence per 10,000 persons in the intervention area; B = post-intervention value for VL-affected HH per 1,000 HH/VL incidence per 10,000 persons in the intervention area; C = baseline value for VL-affected HH per 1,000 HH/VL incidence per 10,000 persons in the control area; D = post-intervention value for VL-affected HH per 1,000 HHs/VL incidence per 10,000 persons in the control area. The effect is negative or positive if the VL-affected HH per 1,000 HHs/VL incidence per 10,000 persons is decreased or increased after intervention. Then the percentage reduction by intervention is calculated as (EI/[A]) × 100.
‡p values were calculated by Z statistic for pre- or post-rate differences between intervention and control areas.
§Incidence per 1,000 HH.
¶Incidence per 10,000 persons.

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