The survival of Cryptosporidium parvum oocysts in anaerobic digesters treating manure was investigated for mesophilic, thermophilic, and a combined treatment (mesophilic–thermophilic–mesophilic) under different retention times of oocysts in the reactors. C. parvum DNA was extracted with an optimised protocol, and its amount determined by quantitative real-time PCR (qPCR). Results indicated noteworthy differences in DNA content after the different treatments. DNA was not degraded during the process. However, excystation and infectivity tests showed a reduction of viable oocyst numbers of ≥2 and ≥5 log units after the thermophilic treatment in two different experiments. Thus qPCR-targeting DNA can overestimate the number of oocysts that survive and remain viable after anaerobic digestion. However, targeting DNA is suitable to indicate the presence or absence of oocysts. Reverse transcription qPCR (RT-qPCR) targeting C. parvum hsp70 mRNA successfully indicated the presence of viable fraction of oocysts.
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Research Article|
April 01 2006
Quantification of Cryptosporidium parvum in anaerobic digesters treating manure by (reverse-transcription) quantitative real-time PCR, infectivity and excystation tests Available to Purchase
G. Garcés;
*Institute for Water Quality Control, Technical University of Munich, Am Coulombwall, 85748 Garching, Germany
E-mail: [email protected]
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M. Effenberger;
M. Effenberger
**Bavarian State Research Center for Agriculture, Institute of Agricultural Engineering, Farm Buildings and Environmental Technology, Voettinger Str. 36, 85354 Freising, Germany
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M. Najdrowski;
M. Najdrowski
***Institute of Parasitology, University of Leipzig, An den Tierkliniken 33, 04103 Leipzig, Germany
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C. Wackwitz;
C. Wackwitz
***Institute of Parasitology, University of Leipzig, An den Tierkliniken 33, 04103 Leipzig, Germany
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A. Gronauer;
A. Gronauer
**Bavarian State Research Center for Agriculture, Institute of Agricultural Engineering, Farm Buildings and Environmental Technology, Voettinger Str. 36, 85354 Freising, Germany
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P.A. Wilderer;
P.A. Wilderer
*Institute for Water Quality Control, Technical University of Munich, Am Coulombwall, 85748 Garching, Germany
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M. Lebuhn
M. Lebuhn
*Institute for Water Quality Control, Technical University of Munich, Am Coulombwall, 85748 Garching, Germany
**Bavarian State Research Center for Agriculture, Institute of Agricultural Engineering, Farm Buildings and Environmental Technology, Voettinger Str. 36, 85354 Freising, Germany
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Water Sci Technol (2006) 53 (8): 195–202.
Citation
G. Garcés, M. Effenberger, M. Najdrowski, C. Wackwitz, A. Gronauer, P.A. Wilderer, M. Lebuhn; Quantification of Cryptosporidium parvum in anaerobic digesters treating manure by (reverse-transcription) quantitative real-time PCR, infectivity and excystation tests. Water Sci Technol 1 April 2006; 53 (8): 195–202. doi: https://doi.org/10.2166/wst.2006.250
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