Lactose-Fermenting Bacteria in Faeces

Growth advantage of fast lactose-fermenting mutants of slow lactose-fermenting coliform bacteria in gnotobiotic rats and mice.

When germ-free rats or mice were mono-associated with either Escherichia coli lac(-) (ATCC 15939) or a slow lactose-fermenting coliform (Paracolobactrum coliforme ATCC 11605), fast lactose-fermenting mutants overgrew the parent organisms.

Lactose-fermenting Salmonella.

Salmonella species are generally considered to be unable to ferment lactose and sucrose according to Bergey's Manual. Recently, however, J. M. Bulmash, McD. Fulton, and J. Jiron (J. Bacteriol. 89:259, 1965) and L. J. Kunz and W. H. Ewing (J. Bacteriol. 89:1629, 1965) have reported two separate species of Salmonella capable of fermenting lactose and sucrose. The organism reported here again illu...

Dissociation and Lactase Activity in Slow Lactose-Fermenting Bacteria of Intestinal Origin.

In 1918 Bronfenbrenner and Davis observed that intestinal bacteria were frequently encountered which failed to show up as lactose fermenters in the routine diagnostic procedure, but which readily did so on subsequent cultivation in media containing lactose in higher concentrations. Studies of the conditions under which the fermentation of lactose by these organisms could be enhanced, with the p...

Lactose-fermenting Organisms Resembling Neisseria Meningitidis.

Incidence of infectious drug resistance among lactose-fermenting bacteria isolated from raw and treated sewage.

Raw and treated sewage samples were examined for antibiotic-resistant, lactose-fermenting bacteria. Approximately 1% of the total lactose-fermenting bacteria were multiply resistant. Of these organisms, 50% were capable of transferring all or part of their resistance to a drug-sensitive recipient. Only 43% of those isolated on media containing a single antibiotic were capable of resistance tran...