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

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