Comparison study on three protocols used to concentrate poliovirus type 1 from drinking water

Area of Science:

• Environmental microbiology
• Virology
• Water quality analysis

Background:

• Enteric viruses in water pose a significant public health risk.
• Efficient concentration methods are crucial for detecting low levels of viruses in water.
• Glass-based adsorption-elution techniques are commonly used for virus concentration.

Purpose of the Study:

• To compare the efficiency of three glass-based techniques for concentrating enteric viruses from water.
• To determine the optimal method for recovering poliovirus type 1 from large water volumes.
• To rank the sensitivity of glass wool (GW), classical glass powder (CGP), and modified glass powder (MGP) apparatus.

Main Methods:

• Tested three methods: GW adsorption at natural pH, CGP adsorption at pH 3.5, and MGP adsorption at pH 3.5.
• Used a glycine-beef extract solution (pH 9.5) for elution in all techniques.
• Assayed sensitivity using 20-liter tap water samples spiked with poliovirus type 1 (10^1 to 10^7 MPNCU/20 L).

Main Results:

• Recovery rates increased with viral concentration for all methods.
• Maximum efficiencies achieved were 81% for GW, 89% for CGP, and 99% for MGP.
• Statistical analysis (Wilcoxon test) confirmed significant differences in sensitivity, ranking methods as GW < CGP < MGP.

Conclusions:

• The modified glass powder apparatus (MGP) is the most sensitive and efficient method for concentrating enteric viruses from water.
• The MGP technique offers a significant improvement over traditional methods for water virus detection.
• This study provides valuable data for selecting optimal virus concentration techniques in water quality monitoring.