We did not test for the production of CytK by
B. cereus and B. thuringiensis isolates. As milling progressed from
rough to brown to white rice, the percentage of B. cereus isolates
with toxin-producing potential decreased. For example, immunoassays showed that the frequency of B. cereus producing L2
components (hblC products) isolated from rice significantly
(P 0.01) decreased as milling progressed (Table 5).