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Excystation of Cryptosporidium parvum at temperatures that are reached during solar water disinfection.
Parasitology. 2009 Apr; 136(4):393-9.P

Abstract

Species belonging to the genera Cryptosporidium are recognized as waterborne pathogens. Solar water disinfection (SODIS) is a simple method that involves the use of solar radiation to destroy pathogenic microorganisms that cause waterborne diseases. A notable increase in water temperature and the existence of a large number of empty or partially excysted (i.e. unviable) oocysts have been observed in previous SODIS studies with water experimentally contaminated with Cryptosporidium parvum oocysts under field conditions. The aim of the present study was to evaluate the effect of the temperatures that can be reached during exposure of water samples to natural sunlight (37-50 degrees C), on the excystation of C. parvum in the absence of other stimuli. In samples exposed to 40-48 degrees C, a gradual increase in the percentage of excystation was observed as the time of exposure increased and a maximum of 53.81% of excystation was obtained on exposure of the water to a temperature of 46 degrees C for 12 h (versus 8.80% initial isolate). Under such conditions, the oocyst infectivity evaluated in a neonatal murine model decreased statistically with respect to the initial isolate (19.38% versus 100%). The results demonstrate the important effect of the temperature on the excystation of C. parvum and therefore on its viability and infectivity.

Authors+Show Affiliations

Laboratorio de Parasitología, Departamento de Microbiología y Parasitología, Facultad de Farmacia, Universidad de Santiago de Compostela, Campus Universitario Sur, 15782 Santiago de Compostela (La Coruña), Spain.No affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Evaluation Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

19195413

Citation

Gómez-Couso, H, et al. "Excystation of Cryptosporidium Parvum at Temperatures That Are Reached During Solar Water Disinfection." Parasitology, vol. 136, no. 4, 2009, pp. 393-9.
Gómez-Couso H, Fontán-Sainz M, Fernández-Alonso J, et al. Excystation of Cryptosporidium parvum at temperatures that are reached during solar water disinfection. Parasitology. 2009;136(4):393-9.
Gómez-Couso, H., Fontán-Sainz, M., Fernández-Alonso, J., & Ares-Mazás, E. (2009). Excystation of Cryptosporidium parvum at temperatures that are reached during solar water disinfection. Parasitology, 136(4), 393-9. https://doi.org/10.1017/S0031182009005563
Gómez-Couso H, et al. Excystation of Cryptosporidium Parvum at Temperatures That Are Reached During Solar Water Disinfection. Parasitology. 2009;136(4):393-9. PubMed PMID: 19195413.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Excystation of Cryptosporidium parvum at temperatures that are reached during solar water disinfection. AU - Gómez-Couso,H, AU - Fontán-Sainz,M, AU - Fernández-Alonso,J, AU - Ares-Mazás,E, Y1 - 2009/02/06/ PY - 2009/2/7/entrez PY - 2009/2/7/pubmed PY - 2009/5/12/medline SP - 393 EP - 9 JF - Parasitology JO - Parasitology VL - 136 IS - 4 N2 - Species belonging to the genera Cryptosporidium are recognized as waterborne pathogens. Solar water disinfection (SODIS) is a simple method that involves the use of solar radiation to destroy pathogenic microorganisms that cause waterborne diseases. A notable increase in water temperature and the existence of a large number of empty or partially excysted (i.e. unviable) oocysts have been observed in previous SODIS studies with water experimentally contaminated with Cryptosporidium parvum oocysts under field conditions. The aim of the present study was to evaluate the effect of the temperatures that can be reached during exposure of water samples to natural sunlight (37-50 degrees C), on the excystation of C. parvum in the absence of other stimuli. In samples exposed to 40-48 degrees C, a gradual increase in the percentage of excystation was observed as the time of exposure increased and a maximum of 53.81% of excystation was obtained on exposure of the water to a temperature of 46 degrees C for 12 h (versus 8.80% initial isolate). Under such conditions, the oocyst infectivity evaluated in a neonatal murine model decreased statistically with respect to the initial isolate (19.38% versus 100%). The results demonstrate the important effect of the temperature on the excystation of C. parvum and therefore on its viability and infectivity. SN - 1469-8161 UR - https://www.unboundmedicine.com/medline/citation/19195413/Excystation_of_Cryptosporidium_parvum_at_temperatures_that_are_reached_during_solar_water_disinfection_ L2 - https://www.cambridge.org/core/product/identifier/S0031182009005563/type/journal_article DB - PRIME DP - Unbound Medicine ER -