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Published on: September 5, 2013
Modified Field's staining--a rapid stain for Trichomonas vaginalis
M Yusuf Afzan1, S Sivanandam, G Suresh Kumar
1Department of Parasitology, Faculty of Medicine, University of Malaya, Kuala Lumpur, Malaysia.
Diagnostic Microbiology and Infectious Disease
|September 18, 2010
Summary
Modified Field's (MF) stain offers rapid and clear visualization of Trichomonas vaginalis, outperforming Giemsa and Gram stains for parasite diagnosis. This faster method enhances differentiation of key cellular structures, improving diagnostic accuracy.
Area of Science:
- Medical Parasitology
- Diagnostic Microbiology
- Protozoology
Background:
- Trichomonas vaginalis is a common genitourinary parasite transmitted sexually.
- Current diagnosis relies on in vitro culture and Giemsa or Gram staining.
- Limitations exist in the clarity and speed of existing staining methods.
Purpose of the Study:
- To compare the efficacy of modified Field's (MF) stain against Giemsa and Gram stains for T. vaginalis.
- To evaluate the speed and contrast provided by MF stain in parasite visualization.
- To assess MF stain's utility in diagnostic settings, particularly with spiked urine samples.
Main Methods:
- Comparison of MF, Giemsa, and Gram stains on axenic and xenic T. vaginalis isolates.
- Staining of smears from spun culture sediments of four T. vaginalis isolates.
- Evaluation of staining contrast, speed, and visualization of cellular organelles.
Main Results:
- MF staining is rapid (20 seconds) and provides sharper contrast than Giemsa and Gram stains.
- MF stain clearly differentiates the nucleus and cytoplasm of T. vaginalis.
- Vacuoles are more visible with MF stain compared to Giemsa stain, especially in spiked urine samples.
Conclusions:
- Modified Field's stain is a rapid and effective alternative for diagnosing Trichomonas vaginalis.
- Its superior contrast aids in visualizing parasite organelles, enhancing diagnostic clarity.
- MF stain offers a valuable improvement for rapid parasite detection in clinical laboratories.
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