%0 Journal Article %A Shaw, Elizabeth J. %A Clark, A. D. %A Anderson, Felicity M. %T R Factors In Enterobacteriaceae Causing Asymptomatic Bacteriuria Of Pregnancy %D 1973 %J Journal of Medical Microbiology, %V 6 %N 4 %P 455-459 %@ 1473-5644 %R https://doi.org/10.1099/00222615-6-4-455 %I Microbiology Society, %X SUMMARY The frequency of antibiotic resistance in coliform bacilli causing asymptomatic bacteriuria of pregnancy in two hospitals in West London was studied. Approximately one-fifth of the strains were resistant to at least one antibiotic. No increase in resistance was shown when these figures were compared with a previous study of symptomatic bacteriuria made in 1968–69, although both studies show an increase compared with figures obtained in 1962–63. In one-third of strains, resistance was shown to be mediated by R factors. %U https://www.microbiologyresearch.org/content/journal/jmm/10.1099/00222615-6-4-455