Transient bacillemia by bio-insecticides in chronic feeding test on mice (Bacillus moritai series no. 2).

The previous report1) on spores of Bacillus moritai described that even when massive quantities of the spores were given orally to mice, these were not detectable in the blood. Whether or not a long-term feeding test also gives similar results was re-examined, as Stuart2) reported that Bacillus thuringiensis invaded various tissues of mice when fed a diet containing the spores, although rapid clearance or decrease from the tissues followed after the withdrawal from the test diet. This paper reports the detection of Bacillus moritai in various tissues of mice as well as in blood following continuous feeding of these spores. In addition, a conccurent experiment on Bacillus thuringiensis has been included for comparison.