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Discovery of New Intracellular Pathogens by Amoebal Coculture and Amoebal Enrichment Approaches
Published on: October 27, 2013
Advances in the detection of deadly free-living amoebae (FLA)
Somashree Pandit1, Shreyasee Hazra1, Suman Kalyan Dinda1
1Department of Biomedical Science and Technology, School of Biological Sciences, Ramakrishna Mission Vivekananda Educational and Research Institute (RKMVERI), Kolkata, India.
Abstract:
Free-living amoebae (FLA), including Naegleria fowleri, Acanthamoeba castellanii, Balamuthia mandrillaris, and Sappinia pedata, are ubiquitous protozoa capable of causing severe infections such as primary amoebic meningoencephalitis (PAM), granulomatous amoebic encephalitis (GAE), and Acanthamoeba keratitis (AK). Early diagnosis remains challenging due to disease rarity, nonspecific clinical presentation, and limited access to specialized laboratory methods. Rapid and accurate detection is critical for patient management and public health response, particularly amid changing environmental exposures. This review summarizes current diagnostic approaches in clinical and environmental contexts, including specimen handling, microscopy, culture, immunohistochemistry, antigen detection, and molecular methods such as conventional PCR, real-time PCR, multiplex qPCR, LAMP, and metagenomic next-generation sequencing. Environmental surveillance, biomarker discovery, quality assurance, and standardized protocols are also discussed. By evaluating strengths and limitations of available tools, this review highlights diagnostic gaps and future priorities to enhance sensitivity, turnaround time, and global accessibility.
Insights
Accurate diagnosis of free-living amoebae (FLA) infections like PAM and GAE is crucial but challenging. This review evaluates current diagnostic methods to improve detection sensitivity, speed, and accessibility for better patient outcomes.
Area of Science:
- Medical Microbiology
- Infectious Diseases
- Diagnostic Technologies
Background:
- Free-living amoebae (FLA) are protozoa causing severe human infections, including primary amoebic meningoencephalitis (PAM) and granulomatous amoebic encephalitis (GAE).
- Challenges in early diagnosis stem from rare occurrence, vague symptoms, and limited access to specialized diagnostic tools.
- Timely and precise detection is vital for patient management and public health, especially with evolving environmental exposures.
Purpose of the Study:
- To review and evaluate current diagnostic methods for free-living amoebae (FLA) in clinical and environmental settings.
- To identify strengths and weaknesses of existing diagnostic tools to pinpoint areas for improvement.
- To highlight future research priorities for enhancing diagnostic sensitivity, speed, and global accessibility.
Main Methods:
- Comprehensive review of diagnostic techniques for FLA, encompassing microscopy, culture, and molecular methods.
- Evaluation of specimen handling, immunohistochemistry, antigen detection, PCR (conventional, real-time, multiplex qPCR), LAMP, and metagenomic next-generation sequencing.
- Discussion of environmental surveillance, biomarker discovery, quality assurance, and protocol standardization.
Main Results:
- Current diagnostic methods for FLA vary in sensitivity, specificity, and turnaround time.
- Molecular techniques like PCR and metagenomics offer high sensitivity but may require specialized infrastructure.
- Standardization and quality assurance are critical for reliable FLA detection across different settings.
Conclusions:
- There is a need for improved diagnostic strategies for FLA infections to enhance early detection and patient outcomes.
- Future efforts should focus on developing rapid, sensitive, and accessible diagnostic tools for both clinical and environmental surveillance.
- Standardized protocols and global collaboration are essential to combat the public health threat posed by FLA.
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