Waterborne pathogens remain a significant cause of illness globally. Routine, sensitive detection of Cryptosporidium parvum, Giardia lamblia, Campylobacter jejuni, and Escherichia coli in drinking water is central to public health monitoring but the extraction step is frequently the bottleneck in both field and laboratory workflows.

A 2021 paper in Microorganisms (Sun et al., Macquarie University and University of Otago) established a universal enzyme-based workflow using prepGEM Bacteria chemistry coupled with polycarbonate filter-based water sampling.

The detection limits:

• 4 oocysts per reaction for Cryptosporidium

• 12 cysts for Giardia

• 2 cells for Campylobacter jejuni, and

• 19cells for E. coli.

The method is compatible with sample volumes up to 100 ml and was designed with field deployment in mind as the enzyme-based extraction requires no centrifuge, column, or organic solvents.

The practical implication is a single, validated extraction protocol covering the four pathogens most commonly monitored in drinking water surveillance, running on the same prepGEM Bacteria chemistry used in a standard thermal cycler.

Water quality monitoring requirements are tightening in multiple jurisdictions, with particular attention on protozoan pathogens alongside bacterial indicators. A published enzymatic workflow with quantified sensitivity data provides a useful starting point for laboratories developing or validating new testing methods.