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Swine hepatitis E virus (HEV) is a newly identified potentially zoonotic agent that is possibly transmitted to humans from pigs. Swine HEV is prevalent in pig populations and does not cause abnormal clinical symptoms in infected pigs, further implicating a likelihood of a risk of transmission to humans by normal contact. To date in North America, only one(More)
Porcine reproductive and respiratory syndrome virus (PRRSV) is the causative agent of PRRS, which is characterized by late-term abortions in sows and respiratory disease in young pigs. Using an infectious cDNA clone of North American PRRSV strain P129, the viral genome was engineered to transcribe an additional subgenomic RNA initiating between(More)
PRRSV (porcine reproductive and respiratory syndrome virus) nucleocapsid (N) protein is the most abundant structural protein of the virus. During infection, the N protein is specifically localized to the nucleus and nucleolus in addition to its normal cytoplasmic distribution. Previously, a nuclear localization signal (NLS, 41-PGKK(N/S)KKKN)-null mutant(More)
Rhodococcus equi causes fatal granulomatous pneumonia in foals and immunocompromised animals and humans. However, there is no effective vaccine against this infection. In this study, the chromosomal genes isocitrate lyase (icl) and cholesterol oxidase (choE) were chosen as targets for mutation and assessment of the double mutant as an intrabronchial vaccine(More)
This study examined the prevalence and expression of the "consensus" and the "atypical"cpb2 genes in Clostridium perfringens isolates from cattle, chickens, dogs, goats, horses, pigs and sheep using polymerase chain reaction (PCR), sodium dodecyl sulfate-polyacrylamide gel electrophoresis followed by Western blotting. Almost all porcine isolates (12/14)(More)
A 1.5-year-old female rabbit (doe) was presented with a 3-day history of lethargy, anorexia, and mild facial swelling. The animal died shortly after examination and severe, acute hemorrhagic pneumonia was noted grossly. An alphaherpesvirus consistent with leporid herpesvirus-4 was isolated and characterized from this animal. This is the first confirmed(More)
There currently are commercial fowlpox virus (FPV)-vectored vaccines for use in chickens, including TROVAC-AIV H5, which expresses the hemagglutinin (HA) antigen of an avian influenza virus and can confer immunity against avian influenza in chickens. Despite the use of recombinant FPV (rFPV) for vaccine delivery, very little is known about the immune(More)
Genomes of two low pathogenic H5N1 avian influenza (LPAI) viruses, A/Turkey/ON/84/1983 and A/Mallard/ON/499/2005 from Ontario, Canada were cloned and genetically characterized. Phylogenetic analysis showed that the Canadian isolates cluster with other North American AIVs and are distinct from the Euro-Asian H5N1 isolates. Individual gene comparisons(More)
To analyze further the role in virulence of the prominent cholesterol oxidase (ChoE) of Rhodococcus equi, an allelic exchange choE mutant from strain 103+ was constructed and assessed for virulence in macrophages, in mice, and in foals. There was no difference between the mutant and parent strain in cytotoxic activity for macrophages or in intra-macrophage(More)
Rhodococcus equi can cause severe or fatal pneumonia in foals as well as in immunocompromised animals and humans. Its ability to persist in macrophages is fundamental to how it causes disease, but the basis of this is poorly understood. To examine further the general application of a recently developed system of targeted gene mutation and to assess the(More)