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To date, three genotypes A, B, and C of bovine parainfluenza virus type 3 (BPIV3) have been isolated from cattle and only limited studies on the pathogenesis of the genotype A of BPIV3 infection in calves and laboratory animals have been conducted. The pathogenesis of the genotypes B and C of BPIV3 infection in calves and laboratory animals have not been reported. To alleviate the difficulties associated with sourcing suitable calves for infection studies, the establishment of BPIV3 infection model using laboratory model animals could aid in increasing the knowledge of the pathogenesis of this virus. Therefore thirty Balb/c mice were intranasally inoculated with a Chinese BPIV3 strain SD0835 which was classified as genotype C. Virus replications in mice were demonstrated by using virus isolation and titration, immunofluorescent staining, and immunohistochemistry and had occurred in the respiratory tissues as early as 24h after intranasal inoculation. The results of immunofluorescent staining and IHC implicated that the lungs and tracheas might be the major tissues in which the SD0835 infected and replicated. The histopathologic examinations revealed that alveoli septa thickening and focal cellulose pneumonia were seen in the lungs of experimentally infected mice. The aforementioned results indicated that the SD0835 of the genotype C was pathogenic to Balb/c mice and the mouse infection model could cast light on the genotype C of BPIV3 infection process and pathogenesis., (Copyright © 2012 Elsevier B.V. All rights reserved.)

Bovine parainfluenza virus type 3 (BPIV3) is one of the most important of the known viral respiratory pathogens of both young and adult cattle. However BPIV3 has not been detected or isolated in China prior to this study. In 2008, four BPIV3 strains were isolated with MDBK cells from cattle in China and characterized by RT-PCR, nucleotide sequence analysis, transmission electron microscope observation, hemadsorption and hemagglutination tests. Nucleotide phylogenetic analysis of partial hemagglutinin-neuraminidase (HN) gene for four isolates and the complete genome for the SD0835 isolate implicated that the four Chinese BPIV3 strains were distinct from the previously reported genotype A (BPIV3a) and genotype B (BPIV3b) and might be a potentially new genotype, which was tentatively classified as genotype C (BPIV3c). This is the first study to report the isolation and genetic characterization of BPIV3 from cattle in China., (Copyright © 2010 Elsevier B.V. All rights reserved.)

Eighteen bovine viral diarrhea viruses (BVDV) from cattle in China between 2005 and 2008 were genetically typed by sequencing of the 5'-untranslated region (5'-UTR) of the viral genome and for selected isolates the N(pro) region. Phylogenetic reconstructions indicated that all of the 18 BVDV positive samples examined in this work clustered within the BVDV type 1 genotype. Of the 15 previously described subgenotypes of BVDV1 (1a-1o), 12 of the samples examined in this work clustered with the Chinese BVDV ZM-95 strain of pig origin, which was the prototype of BVDV1m, while 2 samples clustered with the BVDV1b. But 4 samples formed a separate group appearing to be a potentially new subgenotype, which was tentatively typed as "BVDV1p". Based on these results there appears to be highly genetic variation within the Chinese BVDV field isolates. As well, the phylogenetic reconstructions indicate that the clustering of the Chinese BVDV1m subgenotype in the phylogenetic tree is a result of geographic isolation. The information obtained from this work will be useful when carrying out epidemiological surveys of BVDV detected in China, especially for the BVDV1m detection in Chinese cattle., ((c) 2009 Elsevier B.V. All rights reserved.)