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Analytical Field Methods


Coliphage are viral indicators that infect and replicate in coliform bacteria, primarily E. coli. The OWML analyzes water samples by use of two USEPA-approved coliphage methods—the two step enrichment procedure (presence or absence results) and the single-agar layer procedure (quantitative results).

Coliphage in water by two-step enrichment procedure
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Coliphage in water by a single-agar layer procedure
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