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用苏云金杆菌以色列变种187株（简称Bt－187）于1983年2月～1984年5月对哺乳动物进行了急性毒性试验，结果表明：该菌对哺乳动物无急性毒性和致病力。为了解该菌是否对哺乳动物产生亚急性毒性，1984年8月～1985年3月进行了该菌对哺乳动物的亚急性毒性试验，现将结果报告如下。?
The acute toxicity test of 187 Bacillus thuringiensis isolates (Bt-187) from February 1983 to May 1984 showed that this bacterium had no acute toxicity and pathogenicity to mammals. In order to understand whether this bacterium has sub-acute toxicity to mammals, the subacute toxicity test of this bacterium to mammals was conducted from August 1984 to March 1985, and the results are reported as follows. ?