Abstract
A total of 107 R factors was demonstrated in 103Escherichia coli strains isolated from the urine of patients with urinary tract infections. Four of the strains were in a hetero-R state, i.e. each cell possessed two R factors with different types of transfer factors. Of the total number of R factors, 76.6% were fi+ and 23.4% fi−. The recipient strainCitrobacter O-7, 3b, 1c accepted all the given R factors, while the other,Salmonella typhimurium, accepted only 20%. Both the recipient strains accepted fi+ and fi− factors. We presume that the transmissibility of R factors depends on their type of transfer factor, but in relation to criteria other than fi+ and fi− and the recipient's affinity.
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Abbreviations
- R factor:
-
resistance factor
- fi:
-
fertility inhibition
- A:
-
ampicillin
- S:
-
streptomycin
- T:
-
tetracycline
- C:
-
chloramphenicol
- N:
-
neomycin
- K:
-
kanamycin
- Su:
-
sulphonamides
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Horák, V. R factors ofEscherichia coli strains causing urinary tract infections, their types of transfer factors and differences in their transmissibility toCitrobacter andSalmonella typhimurium recipient strains. Folia Microbiol 16, 317–322 (1971). https://doi.org/10.1007/BF02872813
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DOI: https://doi.org/10.1007/BF02872813