TABLE 2.

Toxin-producing Bacillus spp. from different sources

Source	Total no. of strains	No. of enterotoxin- producing strainsa	No. of putative emetic toxin- producing strainsb	No. of strains that produce both types of toxins
Natural water	42	3	0	0
Tap water	100	1	1	0
Foods	122	1	1	0
Food plant	10	0	0	0
Spices	59	1	1	1
Total	333	6	3	1

^aCytotoxicity assay on Vero cells (28) based on duplicate experiments repeated three times.

^bAccording to the boar sperm motility assay (4).