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Applied and Environmental Microbiology, July 2003, p. 4183-4189, Vol. 69, No. 7
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.7.4183-4189.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.

Identification of Cryptosporidium spp. Oocysts in United Kingdom Noncarbonated Natural Mineral Waters and Drinking Waters by Using a Modified Nested PCR-Restriction Fragment Length Polymorphism Assay

R. A. B. Nichols, B. M. Campbell, and H. V. Smith*

Scottish Parasite Diagnostic Laboratory, Stobhill Hospital, Glasgow G21 3UW, United Kingdom

Received 2 December 2002/ Accepted 25 April 2003

We describe a nested PCR-restriction fragment length polymorphism (RFLP) method for detecting low densities of Cryptosporidium spp. oocysts in natural mineral waters and drinking waters. Oocysts were recovered from seeded 1-liter volumes of mineral water by filtration through polycarbonate membranes and from drinking waters by filtration, immunomagnetizable separation, and filter entrapment, followed by direct extraction of DNA. The DNA was released from polycarbonate filter-entrapped oocysts by disruption in lysis buffer by using 15 cycles of freeze-thawing (1 min in liquid nitrogen and 1 min at 65°C), followed by proteinase K digestion. Amplicons were readily detected from two to five intact oocysts on ethidium bromide-stained gels. DNA extracted from Cryptosporidium parvum oocysts, C. muris (RN 66), C. baileyi (Belgium strain, LB 19), human-derived C. meleagridis, C. felis (DNA from oocysts isolated from a cat), and C. andersoni was used to demonstrate species identity by PCR-RFLP after simultaneous digestion with the restriction enzymes DraI and VspI. Discrimination between C. andersoni and C. muris isolates was confirmed by a separate, subsequent digestion with DdeI. Of 14 drinking water samples tested, 12 were found to be positive by microscopy, 8 were found to be positive by direct PCR, and 14 were found to be positive by using a nested PCR. The Cryptosporidium species detected in these finished water samples was C. parvum genotype 1. This method consistently and routinely detected >5 oocysts per sample.

* Corresponding author. Mailing address: Scottish Parasite Diagnostic Laboratory, Stobhill Hospital, Glasgow G21 3UW, United Kingdom. Phone: 44(0)141-201-3028. Fax: 44(0)141-558-5508. E-mail:h.v.smith{at}spdl.org.uk.

Applied and Environmental Microbiology, July 2003, p. 4183-4189, Vol. 69, No. 7
0099-2240/03/$08.00+0     DOI: 10.1128/AEM.69.7.4183-4189.2003
Copyright © 2003, American Society for Microbiology. All Rights Reserved.



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