Veterinary MedicineInfectious DiseasesPathobiologyDiagnostic MicrobiologyMedical MicrobiologyFungal DiagnosticsFungal PathologyInfectious Disease DetectionMicroscopic ExaminationPathogen DetectionPathogenesis Of Infectious DiseaseCryptosporidial AgentsCryptosporidiosis PathologyCryptosporidium Oocyst Detection
Cryptosporidium spp is a widely accepted cause of gastroenteritis, yet distinguishing its oocysts from other acid‑fast bodies in feces remains difficult. The authors propose a routine two‑stage test that screens with auramine phenol and carbol fuchsine and confirms with a modified Ziehl‑Neelsen stain. Additional confirmation methods include Jenner and Giemsa staining, a modified formol‑ether concentration, and definitive identification by immunofluorescence and thin‑section electron microscopy. The study reports the first detection of Cryptosporidium oocysts in vomitus, confirms its importance as a pediatric gastroenteritis pathogen, and suggests a seasonal trend.
Cryptosporidium spp is now widely accepted as a cause of gastroenteritis. Various methods have been applied to detect oocysts in faeces, but the difficulties of discriminating between non-cryptosporidial bodies, acid fast bodies like cryptosporidia, and cryptosporidia remain. A simple examination in two stages, suitable for routine use is described, using auramine phenol and carbol fuchsine for screening and a modified Ziehl-Neelsen staining method for confirmation. A further method, using Jenner and Giemsa stains, is of value for confirmation of identity, especially where fluorescence microscopy is unavailable. A modification of the formol-ether method of concentration is also described. Immunofluorescence and thin section electron microscopy provide definitive identification. Vomiting can be an important clinical feature of gastroenteritis, and the first description of oocysts in vomit is reported. Preliminary findings, after more than two years of study show that Cryptosporidium is an important pathogenic agent in gastroenteritis, confirm the increased incidence in children, and suggest a possible seasonal trend.