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Parasitic hazard with sewage sludge applied to land
D Barbier1, D Perrine, C Duhamel
1Laboratoire de Parasitologie, U.F.R. des Sciences Pharmaceutiques 1, Caen, France.
Applied and Environmental Microbiology
|May 1, 1990
Summary
A modified FAUST technique efficiently recovered Taenia saginata eggs from sewage sludge. High viable egg counts pose a significant risk to cattle, even after a three-week no-grazing period.
Area of Science:
- Environmental Science
- Veterinary Parasitology
- Public Health
Background:
- Taenia saginata, a tapeworm affecting cattle and humans, poses a significant public health and economic concern.
- Sewage sludge is a potential reservoir for helminth eggs, including Taenia species.
- Effective monitoring of parasite eggs in sludge is crucial for risk assessment.
Purpose of the Study:
- To modify and validate the FAUST technique for efficient recovery and quantification of Taenia saginata eggs from sewage sludge.
- To assess the viability and prevalence of Taenia saginata eggs in sewage sludge.
- To evaluate the associated risks to cattle, even after standard "no-grazing" periods.
Main Methods:
- Adaptation of the Filtration, अल्ट्राfiltration, and Sedimentation Technique (FAUST) for sewage sludge analysis.
- Quantitative recovery and microscopic examination of Taenia saginata eggs.
- Viability assessment of recovered eggs.
Main Results:
- The modified FAUST technique demonstrated high regularity in recovering Taenia saginata eggs from sewage sludge.
- Despite a low viability rate of 8%, the concentration of viable eggs was high (20.10^6/ha).
- The presence of viable eggs indicates a persistent risk to cattle populations.
Conclusions:
- The modified FAUST technique is effective for monitoring Taenia saginata eggs in sewage sludge.
- Sewage sludge represents a significant source of Taenia saginata infection risk for cattle.
- Current "no-grazing" periods may be insufficient to mitigate the risk posed by viable parasite eggs.