SUMMARY: A wide range of micro-organisms, including yeasts, was found to be inhibited by the primary form of spp., but not by the secondary form. Only one strain, the symbiont of , did not inhibit any of the micro-organisms tested; it is suggested that this strain may not have been isolated in the primary form. Gram-positive bacteria were sensitive to all active isolates of ; each of the yeasts and almost all of the Gram-negative bacteria were sensitive to some but not all isolates. Each isolate was sensitive to some other isolates. The antibiotic activity of was unaffected by autoclaving but was lost after dialysis. Anaerobically incubated spp. did not exhibit antibiotic activity.


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