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Updated: Jun 19, 2026
Particle Agglutination Method for Poliovirus Identification
Published on: April 20, 2011
III. METHOD FOR DETECTING POLIOMYELITIC VIRUS IN SEWAGE AND STOOLS
1Departments of Medicine and Pediatrics, Yale University School of Medicine, New Haven.
Abstract:
1. The active agent in sewage and aqueous suspensions of human stools, capable of producing poliomyelitis in rhesus monkeys after intraperitoneal inoculation, can be precipitated by 50 per cent saturation with ammonium sulfate, and no loss of activity seems to occur during this procedure. 2. The precipitated virus is not consistently "redissolvable" in water. 3. By precipitation and subsequent dialysis of the precipitate, a preparation is obtained which may be smaller in volume, and is less toxic for monkeys, than was the original material. 4. The procedure can be applied in tests on the infectivity of stools, and sewage specimens.
Insights
Researchers developed a method to precipitate the poliovirus from human stool and sewage samples using ammonium sulfate. This technique aids in testing virus infectivity and reduces sample toxicity for monkeys.
Area of Science:
- Virology
- Public Health
- Biochemistry
Background:
- Poliomyelitis is a serious infectious disease caused by poliovirus.
- Detecting poliovirus in environmental samples like sewage is crucial for disease surveillance.
- Existing methods for poliovirus isolation and concentration can be complex and may affect virus viability.
Purpose of the Study:
- To develop a reliable method for concentrating poliovirus from human stools and sewage.
- To assess the feasibility of using ammonium sulfate precipitation for poliovirus isolation.
- To evaluate the infectivity and toxicity of the concentrated viral preparations.
Main Methods:
- Human stool and sewage samples were treated to release the active agent (poliovirus).
- The active agent was precipitated using 50% ammonium sulfate saturation.
- The precipitate was dialyzed to obtain a concentrated preparation.
Main Results:
- Ammonium sulfate precipitation effectively concentrated the poliovirus without significant loss of infectivity.
- The precipitated virus was not consistently redissolvable in water.
- Dialysis of the precipitate yielded a preparation with reduced toxicity for rhesus monkeys.
Conclusions:
- Ammonium sulfate precipitation is a viable method for concentrating poliovirus from clinical and environmental samples.
- This method offers a practical approach for poliovirus infectivity testing.
- The reduced toxicity of the prepared samples is advantageous for animal inoculation studies.
