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Table 2 Total distribution of virulence genes in B. cereus strains collection (n = 174) isolated from foodstuffs in Tunisia

From: Toxigenic potential and antimicrobial susceptibility of Bacillus cereus group bacteria isolated from Tunisian foodstuffs

Toxigenic genes No. (%) of strains positive for target gene(s)
Cooked food (n = 42) Pastry products (n = 37) Cereal products (n = 23) Cooked poultry meat (n = 18) Spices (n = 17) Seafood products (n = 11) Canned products (n = 9) Raw poultry meat (n = 8) Fresh-cut vegetables (n = 5) Dairy products (n = 4) Total (n = 174)
HBL gene complexes
hblC 1 (2.4) 4 (10.8) 1 (4.3) 1(5.6) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 7 (4.0)
hblD 3 (7.1) 0 (0.0) 1(4.3) 0 (0.0) 1 (5.9) 1 (9.1) 0 (0.0) 2 (25.0) 0 (0.0) 0 (0.0) 8 (4.6)
hblA+ hblC 1 (2.4) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 1 (0.6)
hblC+ hblD 7 (16.7) 8 (21.6) 2 (8.7) 0 (0.0) 0 (0.0) 1 (9.1) 2 (22.2) 0 (0.0) 3 (60.0) 1 (25.0) 24 (13.8)
hblA+ hblC+ hblD 5 (11.9) 4(10.8) 2 (8.7) 3 (16.7) 7 (41.2) 4 (36.4) 0 (0.0) 1 (12.5) 1 (20.0) 0 (0.0) 27 (15.5)
hblB+ hblC+ hblD 2 (4.8) 3 (8.1) 1(4.3) 2 (11.1) 1 (5.9) 1 (9.1) 1 (11.1) 1 (12.5) 0 (0.0) 0 (0.0) 12 (6.9)
hblA+ hblB+ hblC+ hblD 6 (14.3) 8 (21.6) 5 (21.8) 2(11.1) 3 (17.6) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 24 (13.8)
 None detected 17 (40.4) 10 (27.0) 11 (47.8) 10 (55.6) 5 (29.4) 4 (36.4) 6 (66.7) 4 (50.0) 1 (20.0) 3 (75.0) 71 (40.8)
NHE gene complexes
nheA 1 (2.4) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 1 (0.6)
nheB 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 1 (5.9) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 1 (0.6)
nheA+ nheB 9 (21.4) 4(10.8) 1(4.3) 1(5.6) 1 (5.9) 2 (18.2) 0 (0.0) 3 (37.5) 0 (0.0) 1 (25.0) 22 (12.6)
NheA+ nheC 2 (4.8) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 2 (1.1)
nheB+ nheC 1 (2.4) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 1 (0.6)
nheA+ nheB+ nheC 29 (69.0) 33 (89.2) 22 (95.7) 17 (94.4) 15 (88.2) 9 (81.8) 9 (100.0) 5 (62.5) 5 (100.0) 3 (75.0) 147 (84.5)
 None detected 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0)
Other genes
cytK 13 (30.1) 15 (40.54) 9 (39.1) 6 (33.3) 9 (52.9) 8 (72.7) 3 (33.3) 1 (12.5) 1 (20.0) 1 (25.0) 66 (37.9)
bceT 17 (40.4) 20 (54.1) 14 (60.9) 9 (50.0) 10 (58.8) 10 (90.9) 2 (22.2) 5 (62.5) 1 (20.0) 0 (0.0) 88 (50.6)
ces 2 (4.8) 1 (2.7) 0 (0.0) 3 (16.7) 1 (5.9) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 0 (0.0) 7 (4.0)