33-38 (6 pages) The presumptive test, using lactose-bile medium, is a rapid and practical method for the detection of B, coli. If the absorptions are omitted, as the data obtained from experiments ...

In the presumptive test, 9 different tubes of lactose broth with 10 fold variations of the water sample are inoculated. If any lactose-fermenting bacteria grow and produce gas, the medium will turn ...

Our experimental work indicates that the best combination of mediums and methods so far developed for routine practice include lactose broth for the presumptive test, eosin methylene blue for the ...