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Updated: Feb 13, 2026

Studying Cryptosporidium Infection in 3D Tissue-derived Human Organoid Culture Systems by Microinjection
Published on: September 14, 2019
Comparison of in vitro viability methods for Cryptosporidium oocysts
Nathan H Vande Burgt1, Agathe Auer1, Annetta Zintl1
1University College of Dublin, School of Veterinary Medicine, Belfield, Dublin 4, Ireland.
Abstract:
The water-borne protozoan parasite Cryptosporidium parvum forms oocysts that can persist for long periods of time in the environment, even though the sporozoites inside the oocysts may no longer be viable, making it difficult to assess the associated risk of infection. In this study, we compared the ability of various in vitro methods to discriminate viable from non-viable oocysts, including excystation, DAPI/PI staining, RNA FISH, PMA-qPCR and a novel polymer slide adhesion method. With the notable exception of our in vitro excystation protocol, all methods were found to be useful for identifying viable oocysts.
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