1.   He has genetically modified the mutans streptococci bacteria, creating a harmless strain capable of vanquishing the variety that destroys teeth.

2.   It was later found to be a harmless strain used as a vaccine for cattle.

3.   The lab uses a harmless strain to test for the presence of anthrax in livestock tissue samples sent in by ranchers and veterinarians.

4.   In Argentina, anthrax spores were discovered in mail, but tests determined that they were a harmless strain of the bacteria.

5.   In Argentina, officials said that spores of anthrax found in a mailed travel brochure were of a harmless strain.