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Pathogens (Basel, Switzerland)2025; 14(11); 1075; doi: 10.3390/pathogens14111075

Comparing the Performance of McMaster, FLOTAC and Mini-FLOTAC Techniques in the Diagnosis of Strongylid Infections in Two Horse Populations in Portugal.

Abstract: The diagnosis of gastrointestinal (GI) strongyle infections in equids is still mainly performed using quantitative coprological techniques, like the McMaster (McM), but more sensitive and precise techniques, like FLOTAC (FL) and Mini-FLOTAC (MF), have been proposed over the past 20 years. The present study aimed to compare the analytical performance of these three methods in the diagnosis of strongyle infections in horses. Between October 2023 and June 2024, 32 fecal samples were processed using the McM, FL and MF techniques to identify strongyles' eggs, estimate their shedding (eggs per gram of feces, EPG), standard errors, sensitivities, precisions, and perform Spearman's correlation and Cohen's kappa analyses. The McM detected a higher shedding (584 ± 179 EPG), in comparison with FL and MF, with both these differences being statistically significant ( < 0.001); FL achieved the highest precision (72%), which differed significantly from McM ( = 0.03). All techniques were positively (r = 0.92-0.96) and significantly ( < 0.001) correlated and shared substantial (k = 0.67-0.76) and significant ( < 0.001) agreement. The MF achieved the highest diagnostic sensitivity (93%), followed by FL (89%) and McM (85%), although not significantly ( = 0.90). These results suggest the usefulness of implementing FL or MF methods in equine medicine for precise and, in the latter case, quick parasitological diagnosis.
Publication Date: 2025-10-22 PubMed ID: 41305313PubMed Central: PMC12655540DOI: 10.3390/pathogens14111075Google Scholar: Lookup
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  • Journal Article
  • Comparative Study

Summary

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Overview

  • This study compares three laboratory techniques—McMaster, FLOTAC, and Mini-FLOTAC—for diagnosing gastrointestinal strongyle infections in horses.
  • The primary focus was on evaluating and contrasting their sensitivity, precision, and overall effectiveness in detecting parasite eggs in fecal samples from horses in Portugal.

Background

  • Gastrointestinal (GI) strongyle infections are common parasitic infections affecting horses, where nematode worms lay eggs detected in feces.
  • Accurate and precise quantitative diagnosis (measuring eggs per gram of feces or EPG) is essential for monitoring infection levels and guiding treatment.
  • McMaster (McM) is a classic coprological technique widely used for quantifying parasite eggs in equids.
  • Newer methods, FLOTAC (FL) and Mini-FLOTAC (MF), have been developed to improve sensitivity (ability to detect infections) and precision (consistency and reproducibility) but needed comparative evaluation in horses.

Methodology

  • Timeframe: Samples collected from October 2023 to June 2024.
  • Sample size: 32 fecal samples obtained from two different horse populations in Portugal.
  • Each sample was processed using the three techniques (McMaster, FLOTAC, Mini-FLOTAC) to detect strongyle eggs and quantify their concentration (eggs per gram, EPG).
  • Statistical analyses conducted included:
    • Calculation of mean EPG and standard errors for each technique.
    • Assessment of diagnostic sensitivity (ability to correctly identify infected samples).
    • Precision measured as consistent reproducibility in repeated counts.
    • Spearman’s correlation to assess the relationship between techniques’ EPG readings.
    • Cohen’s kappa to measure the agreement in infection detection among techniques.

Key Results

  • Egg Shedding (EPG):
    • McMaster reported the highest mean egg counts at 584 ± 179 EPG.
    • Both FLOTAC and Mini-FLOTAC showed significantly lower EPG results than McMaster (p < 0.001), indicating McMaster detected a heavier egg load.

  • Precision:
    • FLOTAC demonstrated the highest precision at 72%, significantly better than McMaster (p = 0.03).
    • Precision indicates FLOTAC gave more consistent repeated measurements compared to McMaster.

  • Diagnostic Sensitivity:
    • Mini-FLOTAC exhibited the greatest sensitivity at 93%, followed by FLOTAC at 89%, and McMaster at 85%.
    • Differences in sensitivity between methods were not statistically significant (p = 0.90).
    • This means all methods performed similarly well in detecting infected animals.

  • Correlation and Agreement:
    • All three techniques showed very strong positive correlations in egg counts, with Spearman’s r values between 0.92 and 0.96 (p < 0.001).
    • Cohen’s kappa statistics indicated substantial agreement (k = 0.67-0.76), confirming consistent infection diagnosis between methods.

Interpretation of Findings

  • While McMaster gave higher egg counts, FLOTAC offered superior precision, meaning it was more reliable in repeated measurements despite reporting lower EPG values.
  • Mini-FLOTAC showed the highest sensitivity, making it very effective for detecting positive infections rapidly.
  • Strong correlations and agreement suggest that these methods are largely interchangeable for diagnosing strongyle infections but have varying strengths depending on the context (e.g., speed, precision).
  • The minor differences imply that adopting newer techniques like FLOTAC or Mini-FLOTAC could improve diagnostic accuracy in equine parasitology.

Conclusions and Recommendations

  • The study highlights the usefulness of implementing FLOTAC or Mini-FLOTAC techniques in routine equine parasitological diagnostics.
  • FLOTAC is particularly recommended when precise quantification is important, such as in research or monitoring programs.
  • Mini-FLOTAC offers the advantage of quicker diagnosis combined with high sensitivity, benefiting clinical settings requiring fast results.
  • Continuing to rely solely on McMaster may be less optimal due to lower precision and sensitivity despite higher egg counts.
  • Overall, transition toward these novel techniques promises enhanced detection and management of strongylid infections in horses, contributing to improved animal health.

Cite This Article

APA
Varandas M, Lozano J, Agrícola R, Gomes L, Rosa T, Magalhães M, Lamas L, Rinaldi L, Oliveira M, Paz-Silva A, Madeira de Carvalho L. (2025). Comparing the Performance of McMaster, FLOTAC and Mini-FLOTAC Techniques in the Diagnosis of Strongylid Infections in Two Horse Populations in Portugal. Pathogens, 14(11), 1075. https://doi.org/10.3390/pathogens14111075

Publication

ISSN: 2076-0817
NlmUniqueID: 101596317
Country: Switzerland
Language: English
Volume: 14
Issue: 11
PII: 1075

Researcher Affiliations

Varandas, Marta
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
Lozano, João
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
Agrícola, Ricardo
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
  • Veterinary Hospital, Faculty of Veterinary Medicine, Lusófona University, 1749-024 Lisbon, Portugal.
Gomes, Lídia
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
Rosa, Teresa
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
Magalhães, Mariana
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
Lamas, Luís
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
Rinaldi, Laura
  • Department of Veterinary Medicine and Animal Production, University of Naples Federico II, 80137 Naples, Italy.
Oliveira, Manuela
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.
  • Centre for Ecology, Evolution and Environmental Changes (cE3c), Global Change and Sustainability Institute (CHANGE), Faculty of Sciences, University of Lisbon, 1749-016 Lisbon, Portugal.
Paz-Silva, Adolfo
  • Control of Parasites Research Group (COPAR, GI-2120), Department of Animal Pathology, Faculty of Veterinary, University of Santiago de Compostela, 27002 Lugo, Spain.
Madeira de Carvalho, Luís
  • Centre for Interdisciplinary Research in Animal Health (CIISA), Faculty of Veterinary Medicine, University of Lisbon, 1300-477 Lisbon, Portugal.
  • Associate Laboratory for Animal and Veterinary Sciences (AL4AnimalS), 1300-477 Lisbon, Portugal.

MeSH Terms

  • Animals
  • Horses
  • Feces / parasitology
  • Horse Diseases / diagnosis
  • Horse Diseases / parasitology
  • Portugal / epidemiology
  • Parasite Egg Count / methods
  • Parasite Egg Count / veterinary
  • Strongylida Infections / veterinary
  • Strongylida Infections / diagnosis
  • Strongylida Infections / parasitology
  • Sensitivity and Specificity
  • Strongyle Infections, Equine / diagnosis
  • Strongyle Infections, Equine / parasitology

Grant Funding

  • CIISA/FMV Project UIDB/00276/2020 / Fundação para a Ciência e Tecnologia
  • LA/P/0059/2020-AL4AnimalS / Fundação para a Ciência e Tecnologia
  • PhD fellowship 2020.09037.BD (doi:10.54499/2020.09037.BD) / Fundação para a Ciência e Tecnologia
  • Project ED431B 2021/07 / Consellería de Cultura, Educación, Formación Profesional e Universidades

Conflict of Interest Statement

The authors declare no conflicts of interest.

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