title: Biochemical and serological characterization of hydrogen sulfide-positive variants of Escherichia coli.
abstract: Over 200 H(2)S-positive, gram-negative rods have been characterized by standard biochemical and serological techniques. The results indicate that the isolates are H(2)S-positive variants of Escherichia coli. Comparison of the variants with biochemically typical E. coli suggests that they represent a rather limited subgroup within the species. The H(2)S-positive strains were more resistant to antibiotics than the typical strains; 54% of the H(2)S-positive isolates were resistant to three or more antibiotics compared with only 25% of the typical strains. Similar differences were also seen in the distribution of O and H antigens and in the results of certain biochemical tests.
mesh_terms: D000372:Agglutination Tests; D000667:Ampicillin / Q000494:pharmacology; D000942:Antigens, Bacterial / Q000032:analysis; D004926:Escherichia coli / Q000145:classification / Q000187:drug effects / Q000276:immunology / Q000302:isolation & purification / Q000378:metabolism*; D005243:Feces / Q000382:microbiology; D014644:Genetic Variation; D006801:Humans; D006862:Hydrogen Sulfide / Q000096:biosynthesis*; D010403:Penicillin Resistance; D012703:Serotyping; D013307:Streptomycin / Q000494:pharmacology; D013752:Tetracycline / Q000494:pharmacology; D014556:Urine / Q000382:microbiology
chemical_list: D000942:Antigens, Bacterial; D000667:Ampicillin; D013752:Tetracycline; D013307:Streptomycin; D006862:Hydrogen Sulfide