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R factors from Enterobacter group.

E Romero, M Perduca, L Pagani

    Bollettino Dell'Istituto Sieroterapico Milanese
    |March 31, 1978
    PubMed
    Summary
    This summary is machine-generated.

    Researchers identified 26 antibiotic resistance (R) factors in Enterobacter species, primarily Enterobacter cloacae, from clinical samples. These R factors, transmissible to E. coli K12, were characterized by their incompatibility groups, revealing insights into bacterial resistance mechanisms.

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    Area of Science:

    • Microbiology
    • Molecular Biology
    • Genetics

    Background:

    • Antibiotic resistance is a growing public health concern.
    • Enterobacter species are common causes of hospital-acquired infections.
    • R factors (resistance plasmids) contribute to the spread of antibiotic resistance.

    Purpose of the Study:

    • To characterize R factors found in clinical isolates of Enterobacter species.
    • To determine the transmissibility and incompatibility groups of these R factors.

    Main Methods:

    • Isolation of Enterobacter species from clinical specimens.
    • Derivation of R factors transmissible to Escherichia coli K12.
    • Classification of R factors based on their incompatibility groups.

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    Main Results:

    • Twenty-six R factors were successfully derived from 79 Enterobacter strains.
    • The majority of isolates (71/79) were identified as Enterobacter cloacae.
    • Fifteen R factors were fertility-positive (fi+), with 14 belonging to group FII and 1 to group FI.
    • Eleven R factors were fertility-negative (fi-), belonging to groups M, K, S, or showing incompatibility with S and W groups.

    Conclusions:

    • Enterobacter cloacae is a significant reservoir for transmissible R factors.
    • The characterized R factors represent diverse incompatibility groups, indicating varied plasmid origins and potential for spread.
    • Understanding R factor diversity is crucial for combating the spread of antibiotic resistance in clinical settings.