Abstract
Abstract Three sites on the Whippany River, a tributary of the Passaic Watershed in Morris County, N.J., were monitored for resistance transfer coliforms. A high percentage of fecal coliform isolates showed multiple antibiotic resistance. A significant number of lac − and lac − isolates proved to be donors of transmissible antibiotic resistance plasmids ( R donors), by conjugation with a recipient strain of Salmonella gallinarum . Re-examination of testing methods used for recreational and potable water sources is suggested by these findings.
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