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Titolo:
Quantitation of Cryptosporidium parvum infection in cell culture using a colorimetric in situ hybridization assay
Autore:
Rochelle, PA; Ferguson, DM; Johnson, AM; De Leon, R;
Indirizzi:
Metropolitan Water Dist So Calif La Verne, Water Qual Lab, La Verne, CA 91750 USA Metropolitan Water Dist So Calif La Verne La Verne CA USA 91750 91750 USA
Titolo Testata:
JOURNAL OF EUKARYOTIC MICROBIOLOGY
fascicolo: 5, volume: 48, anno: 2001,
pagine: 565 - 574
SICI:
1066-5234(200109/10)48:5<565:QOCPII>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
SUBUNIT RIBOSOMAL-RNA; TARGETED OLIGONUCLEOTIDE PROBE; IN-SITU; PHYLOGENETIC ANALYSIS; OOCYSTS; VITRO; WATER; GENE; DNA; VISUALIZATION;
Keywords:
aging effects; dose response; enumeration; infectious foci; infectivity; oligonucleotide probe; ribosomal RNA;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
43
Recensione:
Indirizzi per estratti:
Indirizzo: Rochelle, PA Metropolitan Water Dist So Calif La Verne, Water Qual Lab, LaVerne, CA 91750 USA Metropolitan Water Dist So Calif La Verne La Verne CAUSA 91750
Citazione:
P.A. Rochelle et al., "Quantitation of Cryptosporidium parvum infection in cell culture using a colorimetric in situ hybridization assay", J EUKAR MIC, 48(5), 2001, pp. 565-574

Abstract

A quantitative colorimetric in situ hybridization assay was developed for detecting Cryptosporidium parvum infection in cell cultures using a digoxigenin-labeled probe targeting 18S rRNA. Intra-cellular developmental stages of C. parvum such as trophozoites and meronts were clearly discerned by light microscopy as localized areas of dark purple/black precipitate against acolorless background. Infections developed focally and the. term infectious focus was applied to each cluster of developmental stages. There were no significant differences in the number of infectious foci following 24 h or 48 It incubation. However, 24 It and 48 h dose response curves were significantly different when infectivity was measured as the number of developmental stages per monolayer. with an average of 5.3-fold more stages following 48 h incubation. When infectivity was expressed as the. number of infectious foci per inoculum oocyst converted to a percentage, it was demonstrated that the rate of infection decreased with increasing oocyst age. Oocysts of the Iowa isolate that were 7-10 days old demonstrated 7.8 +/-2.4% infectivity (mean +/- standard deviation) compared to 4.2 +/-0.8% for 21-28 day-old oocysts and 1.4 +/-1.3% for 42-70 day-old oocysts. The assay also detected infection with other genotype 2 oocysts and a genotpye 1 isolate. This assay provides a direct quantitative approach for measuring C. parvum infectivity in cell culture.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 22/01/20 alle ore 13:28:17