24-hour detection of enterococci
- Accurate results overnight so you can act quickly to protect the public and public resources.
- Discover enterococci contamination in half the time of standard methods.
- Eliminate tedious membrane filtration work.
- U.S. EPA-approved and included in Standard Methods for Examination of Water and Wastewater.
- An official ASTM Method (#D6503-99)
- No media preparation.
- No autoclaving.
- No colony counting.
- No glassware cleaning.
- Less than 1 minute of hands-on time.
- Results in 24 hours rather than 48 to 72 hours.
- Sensitive to 1 enterococci per 100 mL.
- Enumerates up to 2,419 enterococci per 100 mL without dilutions (with Quanti-Tray/2000).
- Less subjective interpretation.
- 50% fewer false positives and 95% fewer false negatives than the standard membrane filtration (MF) method.1
- Up to 12-month shelf life minimizes waste.
- 24-hour test saves incubator space.
How the Enterolert Test works
The Enterolert Test uses a proprietary Defined Substrate Technology (DST) nutrient indicator to detect enterococci. This nutrient indicator fluoresces when metabolized by enterococci. DST improves accuracy and avoids the need for hazardous sodium azide suppressants used in traditional media.
How to use
Learn how to use the Enterolert Test
Add reagent to sample.
Seal using Quanti-Tray Sealer and incubate for 24 hours at 41°C ± 0.5°C.
Step 4: Quanti-Tray
For counts from 1–200: Count fluorescent wells and refer to most probable number (MPN) table.
Step 4: Quanti-Tray/2000
For counts from 1–2,419: Count fluorescent wells and refer to most probable number (MPN) table.
Frequently asked questions
Yes, the Enterolert Test is U.S. Environmental Protection Agency (EPA)-approved as a method for enterococci detection in following types of water:
- Ambient waters—includes fresh, marine, or estuarine surface water used for recreation, propagation of fish, shellfish, or wildlife; agriculture; industry; navigation; or as source water for drinking water facilities
- Ground water
Some species of enterococci that Enterolert Test detects are: faecalis, faecium, avium, gallinarum, casseliflavis, and durans.
The Enterolert reagent powder should be tan in color; it should be dry and free-flowing. Any concerns about the color or integrity of the powder should be directed to IDEXX Technical Services.
There is no comparator for the Enterolert Test. For comparison, use a negative control when interpreting results.
Resources & Tools
Tests & Accessories
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IDEXX Water has reference materials and approval documents to support the many products in our water portfolio. Find the document(s) you need by selecting the link below.
Search the Reference & Regulatory Documents tool
Product Number: 98-21374-00
Catalog Number: WENT020
Product Number: 98-21375-00
Catalog Number: WENT200
Snap pack and Quanti-Tray bundles are available.
Water Customer Support
IDEXX Laboratories, Inc.
One IDEXX Drive
Westbrook, Maine 04092 USA
1. Budnick GE, Howard RT, Mayo DR. Evaluation of Enterolert for Enumeration of Enterococci in Recreational Water. Appl Environ Microbiol. 1996;62:3881–3884.