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Table 1 Susceptibility status of An. stephensi (October/November, 2006) to standard doses of insecticides (7 such) following WHO methods* (1975) in Mangalore city, Karnataka, South India

From: Reduced susceptibility to selected synthetic pyrethroids in urban malaria vector Anopheles stephensi: a case study in Mangalore city, South India

Diagnostic insecticide dose on impregnated papers# Mosquitoes exposed (n) Dead mosquitoes after 24 h of exposure (n) Mortality after 24 h of exposure (%) Corrected mortality (%)§ KDT50 (CL) KDT95 (CL)
  Expt Cont Expt Cont Expt (95% CI) Cont (95% CI)    
DDT 4% 60 60 59 7 98.3 (92.99-103.65) 11.65 (6.33-16.89) 98.1 (92.95-103.19) 19.24 (18.87-21.48) 55.67 (47.78-68.50)
Malathion 5% 106 106 65 15 45.36 (13.98-76.74) 14.06 (10.93-17.19) 54.9 (46.74-72.42) 765.82 34147.10
Deltamethrin 0.05% 72 72 63 7 86.62 (69.78-103.46) 9.62 (6.24-3.00) 86.1 (76.38-103.93) 37.33 (35.02-39.88) 72.73 (64.96-85.11)
Cyfluthrin 0.15% 77 57 74 8 95.57 (78.5-109.64) 13.93 (9.35-18.51) 95.5 (79.00-110.94) 31.74 (29.50-33.96 69.74 (62.03-81.56)
Alpha-cypermethrin 10% 68 50 62 3 91.2 (86.27-96.13) 6.03 (4.52-7.54) 90.6 (85.34-95.90) 30.33 (27.69-33.12) 83.26 (70.79-104.26)
Lambda-cyhalothrin 0.05% 80 60 79 5 98.75 (94.78-102.72) 8.33 (1.17-15.49) 98.6 (94.10-103.05) 19.20 (17.34-20.97) 50.42 (44.99-58.17)
Permethrin 0.75% 77 57 77 3 100.0 (100.0-100.0) 5.3 (4.04-6.59) 100.0 (100.0-100.0) 16.83 (14.87-18.67) 47.93 (41.35-58.52)
  1. * Mortality recorded < 80% considered resistant, 80-98% tolerant (evaluation required), while > 98% as sensitive.
  2. #Supplied by WHO.
  3. §Corrected mortality was calculated following Abott's formula (1925).
  4. Confidence limit could not be calculated due to large g values.
  5. Exp: Experimental; Cont: Control; CI: Confidence interval; CL: Confidence limit