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Appl Environ Microbiol. 1986 February; 51(2): 312-315

Methods for isolating Campylobacter jejuni from low-turbidity water.

ABSTRACT

Membrane filtration methods were developed and evaluated for the quantitative recovery of Campylobacter jejuni from environmental waters of low turbidity. The best procedure studied involved passaging the test water through a filter (pore size, 0.45 micron) and plating it facedown on Campylobacter-selective agar. The filter was removed after overnight incubation, and the plate was streaked for isolation and then reincubated. This method, with or without prefiltration through 5.0- and 0.6-micron-pore-size membranes consistently resulted in the recovery of 30 C. jejuni CFU/250 ml of seeded natural waters. The other methods, plating the final filter face-up or preincubation of the filter in an enrichment medium, were not as sensitive. The technique described above could be useful in the routine monitoring of finished waters for C. jejuni or during investigations of suspected waterborne outbreaks for water of low turbidity.