. 2017 Apr 13;9(4):139. doi: 10.3390/toxins9040139

Table 1.

Description of the origin of B. thuringiensis isolates and the samples from where they were isolated.

Source of Samples	Samples		Mediterranean Area			Semi-Arid Area			Desert			Global Bt Index
	Samples		No. of Isolates		Bt Index ^d	No. of Isolates		Bt Index ^d	No. of Isolates		Bt Index ^d
	Total Analyzed	Bt Positive ^a	Bacillus-Like ^b	Bt ^c	Bt Index ^d	Bacillus-Like ^b	Bt ^c	Bt Index ^d	Bacillus-Like ^b	Bt ^c	Bt Index ^d
Telluric (soil)
Rhizospheric	18	18	68	35	0.51	39	14	0.36	77	39	0.51	0.48
Non rhizospheric	10	8	11	4	0.36	12	2	0.17	43	12	0.28	0.27
Non telluric
Sediment	3	2	13	5	0.38	0	0	/	1	0	0	0.36
Dead insects	4	4	28	10	0.36	0	0	/	0	0	/	0.36
Grain storage	19	19	62	26	0.42	31	10	0.32	0	0	/	0.39
Total	54	51	182	80	0.44 ^e	82	26	0.32 ^e	121	51	0.42 ^e	0.41 ^f

^a Sample with at least one B. thuringiensis colony; ^b Colonies examined by microscopy; ^c Crystaliferous colonies identified as B. thuringiensis; ^d B. thuringiensis as a fraction of Bacillus-like isolates; ^e Global Bt index in each geographic area; ^f Global Bt index of B. thuringiensis collection.