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Table 1 Geographical distribution of sampling sites, total number of samples (N), and number of Bt-positive, Bt index, and number of larvicidal isolates

From: Isolation and characterization of native Bacillus thuringiensis strains from Saudi Arabia with enhanced larvicidal toxicity against the mosquito vector Anopheles gambiae (s.l.)

City-region Geographic location (GPS) N Bt-positive Bt indexa Larvicidal
Al Madinah 24°28′0″N, 39°36′0″E 52 18 0.43 12
Yanbu 24°5′0″N, 38°0′0″E 32 5 0.12 2
Makkah 21°30′0″N, 41°0′0″E 22 7 0.24 2
Taif 21°16′0″ N, 40°25′0″E 14 5 0.66 0
Jeddah 21°50′0″N, 39°10′0″W 2 0 0
Qassim 25°49′20″N, 42°50′7″E 39 4 0.23 1
Alehssa 25°25′46″N, 49°37′19″E 9 2 0.67 0
Dammam 26°26′0″N 50°07′0″E 7 0 0
Qatif 26°56′0″N, 50°1′0″E 6 0 0
Hafr al Batin 28°26′3″N, 45°57′49″E 22 4 0.21 1
Riyadh region 24°38′0″N, 46°43′0″E 37 9 0.22 1
Asser 19°0′0″N, 43°0′0″E 13 4 0.15 2
Khamis Musheet 18°18′0″N, 42°44′0″E 8 1 0.68 0
Abhaa 18°13′24″N, 42°30′26″E 10 3 0.13 0
Jezan 16°53′21″N, 42°33′40″E 25 5 0.70 2
Najran 17°29′30″N, 44°7′56″E 2 1 0.12 0
Total   300 68 0.35 23
  1. aThe number of identified Bt colonies divided by the total number of spore-forming colonies