[Bowel parasites and faecal eosinophilia]

Area of Science:

• Medical Parasitology
• Gastroenterology
• Clinical Pathology

Background:

• Traditional May-Grünwald-Giemsa staining for fecal polynuclear eosinophils (PE) has limitations.
• These include bacterial overstaining, lipid dissolution, and sensitivity to stool pH.
• A need exists for a more robust and informative staining technique.

Purpose of the Study:

• To evaluate an adapted Wheatley staining technique for fecal polynuclear eosinophils (PE).
• To compare its advantages against the May-Grünwald-Giemsa method.
• To explore the diagnostic utility of fecal PE in various gastrointestinal conditions.

Main Methods:

• Adaptation of the Wheatley staining technique for fecal samples.
• Comparison of staining characteristics with May-Grünwald-Giemsa.
• Analysis of fecal PE presence in patients with helminthiasis, intestinal coccidiosis, other protozoal infections, and intestinal allergies.

Main Results:

• The adapted Wheatley stain shows advantages: less bacterial staining, preserved lipids, and reduced pH dependency.
• Fecal polynuclear eosinophils (PE) are preserved for over a year in stool samples.
• PE are detected in approximately 50% of helminthiasis and intestinal coccidiosis cases, and in intestinal allergies, but not other protozoal infections.

Conclusions:

• The adapted Wheatley staining method for fecal polynuclear eosinophils (PE) is advantageous for diagnosing gastrointestinal conditions.
• Faecal eosinophilia, detected by this method, indicates tissue eosinophilia and is linked to parasitic infections and allergies.
• This technique allows observation of eosinophilia mechanisms not evident in blood eosinophilia.