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Cyst detection and viability assessment of Balantioides coli in environmental samples: Current status and future
Juan José García-Rodríguez1, Pamela C Köster2, Francisco Ponce-Gordo1
1Department of Microbiology and Parasitology, Faculty of Pharmacy, Complutense University, Plaza Ramón y Cajal s/n, 28040 Madrid, Spain.
Abstract:
The ciliate Balantioides coli is a human enteric parasite that can cause life-threatening infections. It is a food- and waterborne parasite, with cysts being the infective stage. Despite its importance as a potential pathogen, few reports have investigated its presence in environmental samples, and some issues need attention including i) The accuracy of B. coli identification. In most cases, the protozoa is identified only by its morphological traits, which can be identical to those from other parasitic ciliates of animals. Genetic analysis of cysts recovered from environmental samples is necessary for species confirmation. In addition, genetic methods used with faecal samples need to be adequately validated with environmental matrices. ii) The methodology for searching this parasite in environmental samples. The protocols include an initial phase to isolate the cysts from the matrix followed by a second phase in which concentration procedures are usually applied. The methods may be valid but are not standardised and differences between studies could affect the results obtained. iii) The areas that needs further research. The development of genetic identification methods and standardised analytical protocols in environmental samples are required, as well as the assessment of viability and infectivity of B. coli cysts. The development of axenic culture systems will boost research on this parasite.
Insights
Balantioides coli, a parasite causing severe human infections, requires accurate identification in environmental samples. Standardized genetic and analytical methods are crucial for detecting this food- and waterborne pathogen.
Area of Science:
- Environmental Parasitology
- Molecular Diagnostics
- Food and Water Safety
Background:
- Balantioides coli is a significant enteric protozoan parasite responsible for potentially fatal human infections.
- It is transmitted via contaminated food and water, with cysts representing the infectious form.
- Limited research exists on its prevalence in environmental settings, highlighting a knowledge gap.
Purpose of the Study:
- To address critical issues in the identification and detection of Balantioides coli in environmental samples.
- To emphasize the need for improved diagnostic accuracy and standardized methodologies for environmental surveillance.
Main Methods:
- Morphological identification is often insufficient and can be confused with other ciliate species.
- Genetic analysis of environmental cysts is essential for accurate species confirmation.
- Current detection protocols involve cyst isolation and concentration but lack standardization across studies.
Main Results:
- Inaccurate identification due to reliance on morphology alone.
- Lack of standardized methods for detecting Balantioides coli in environmental matrices.
- Need for validated genetic assays applicable to environmental samples.
Conclusions:
- Development of reliable genetic identification methods is paramount for accurate Balantioides coli detection.
- Standardized analytical protocols are required for consistent environmental surveillance.
- Further research should focus on cyst viability, infectivity, and axenic culture systems.
