1. Development of a panel of multiplex real-time polymerase chain reaction assays for simultaneous detection of major agents causing calf diarrhea in feces.
- Author
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Cho YI, Kim WI, Liu S, Kinyon JM, and Yoon KJ
- Subjects
- Animals, Cattle, Cattle Diseases microbiology, Coronavirus Infections diagnosis, Coronavirus Infections veterinary, Coronavirus Infections virology, Coronavirus, Bovine isolation & purification, Cryptosporidiosis diagnosis, Cryptosporidiosis parasitology, Cryptosporidiosis veterinary, Cryptosporidium parvum isolation & purification, Diarrhea diagnosis, Diarrhea microbiology, Escherichia coli isolation & purification, Escherichia coli Infections diagnosis, Escherichia coli Infections veterinary, Escherichia coli Infections virology, Feces microbiology, Phylogeny, Polymerase Chain Reaction methods, Rotavirus isolation & purification, Rotavirus Infections diagnosis, Rotavirus Infections veterinary, Rotavirus Infections virology, Salmonella isolation & purification, Salmonella Infections, Animal diagnosis, Salmonella Infections, Animal microbiology, Cattle Diseases diagnosis, Diarrhea veterinary, Polymerase Chain Reaction veterinary
- Abstract
Calf diarrhea is a major economic burden to the bovine industry. Since multiple infectious agents can be involved in calf diarrhea, and the detection of each of the causative agents by traditional methods is laborious and expensive, a panel of 2 multiplex real-time polymerase chain reaction (PCR) assays was developed for rapid and simultaneous detection of the 5 major bovine enteric pathogens (i.e., Bovine coronavirus [BCoV; formally known as Betacoronavirus 1], group A Bovine rotavirus [BRV], Salmonella spp., Escherichia coli K99(+), and Cryptosporidium parvum). The estimated detection limit (i.e., analytic sensitivity) of the panel was 0.1 TCID(50) (50% tissue culture infective dose) for BCoV and group A BRV; 5 and 0.5 colony-forming units for E. coli K99(+) and Salmonella, respectively; and 50 oocysts for Cryptosporidium per reaction. In testing 243 fecal samples obtained from submissions to the Iowa State University Veterinary Diagnostic Laboratory or from experimental animals with known infection status, the newly developed multiplex real-time PCR panel simultaneously detected all 5 pathogens directly from fecal samples and was more rapid and sensitive than the traditional diagnostic tests. The PCR panel showed 89%-97% agreement with those conventional diagnostic tests, demonstrating diagnostic sensitivity equal to or better than that of the conventional tests. In conclusion, the multiplex real-time PCR panel can be a tool for a timely and accurate diagnosis of calf diarrhea associated with BCoV, group A BRV, E. coli K99(+), Salmonella, and/or Cryptosporidium.
- Published
- 2010
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