| r factors in coliform-fecal coliform sewage flora of the prairies and northwest territories of canada. | coliform and fecal coliform populations found in the raw sewages and final sewage effluents of the prairie provinces and the northwest territories were examined for antibiotic resistance and the possession of r factors. it was determined that 8.91% of the total coliform and 10.80% of the fecal coliform populations carried r factors. the following numbers of combinations of r determinants were found: 39 in the escherichia coli population, 6 in the citrobacter population, 20 in the enterobacter po ... | 1981 | 7283425 |