What are Viable But Non-Culturable (VBNC) Legionella cells?

VBNC Legionella cells are a sub-population of bacteria that are metabolically active and potentially infectious but cannot be detected by standard culture-based methods. These cells often form under stress conditions like nutrient starvation, oxidative stress, or heat. Research shows VBNC concentrations can be several orders of magnitude higher than culturable cells, posing a significant challenge for water safety.

How long can Legionella bacteria survive under starvation conditions?

Under starvation conditions, Legionella can lose culturability within 11 days to 8 weeks, depending on the strain. However, these VBNC cells can remain stable for several months, with some sub-populations persisting even after one year of starvation. This prolonged survival highlights the need for robust water treatment solutions.

Why are traditional culture-based methods insufficient for detecting Legionella?

Traditional culture-based methods only detect Legionella cells that can grow in a lab setting, missing the significant proportion of VBNC cells. Since VBNC cells are viable and potentially pathogenic, relying solely on culture-based methods can severely underestimate the actual Legionella risk in engineered water systems. AMPAC USA's advanced systems are designed to mitigate risks from all forms of contaminants.

What primary stressors cause Legionella to form VBNC cells?

The primary stressors that induce Legionella to enter a VBNC state include nutrient starvation, oxidative stress, and heat. These conditions are common in engineered water systems and can lead to the rapid formation of VBNC cells, which are more resilient and harder to detect. AMPAC USA's purification systems are engineered to remove contaminants and maintain water quality, reducing these stressors.

How does AMPAC USA address the risk of Legionella and other waterborne pathogens?

AMPAC USA provides industry-leading commercial and industrial reverse osmosis and water purification systems designed for maximum contaminant removal and long-term reliability. Our engineers, with direct field experience from offshore oil rigs to military bases, ensure our systems effectively manage water quality, preventing the conditions that foster Legionella growth and VBNC formation, thereby ensuring safe, clean water.

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Aug 14, 2018·1 min read

Water Filter Water Treatment

Differential development of Legionella sub-populations during short- and long-term starvation

Sammy FaragAMPAC USA — August 14, 2018

Differential development of Legionella sub-populations during short- and long-term starvation

By Sammy Farag . August 14, 2018

Legionella bacteria in water systems is a big deal in today’s water treatment world. AMPAC USA offers top-tier solutions to make sure you get safe, clean water for your home, business, or industrial needs. Our systems are built to get rid of the most contaminants and stay reliable for years.

<10.1016/j.watres.2018.04.027

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Source: Water Feed