An unstable L-form of Proteus mirabilis was induced on solid medium by sensitivity test discs (200 fig of fosfomycin + 20 μg of glucose-6-phosphate). The L-col-onies were subcultured on agar containing the antibiotic at a concentration of 60 μg/ml. On antibiotic-free medium, all the cells reverted to the bacterial phase. On antibiotic-containing agar, the reversion took place as well although at a much lower frequency. Parents and revertants differed in glucose metabolism while they reacted identically in H2S, indole, and urea test
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