Fernando A. Osorio

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Although North American and European serotypes of porcine reproductive and respiratory syndrome virus (PRRSV) are recognized, only the genome of the European Lelystad strain (LV) has been sequenced completely. Here, the genome of the pathogenic North American PRRSV isolate 16244B has been sequenced and compared with LV. The genomic organization of 16244B(More)
Porcine reproductive and respiratory syndrome virus (PRRSV) infection of swine leads to a serious disease characterized by a delayed and defective adaptive immune response. It is hypothesized that a suboptimal innate immune response is responsible for the disease pathogenesis. In the study presented here we tested this hypothesis and identified several(More)
At times after conjunctival inoculation with bovine herpesvirus type 1 (BHV-1), representing the acute and latent phases of infection, rabbit trigeminal ganglia were examined for the presence of BHV-1 nucleic acids by in situ hybridization using a 3H-labelled BHV-1 DNA probe. During the acute phase of virus infection, both BHV-1 DNA and RNA were detected in(More)
The distribution of retrogradely and transneuronally labeled neurons was studied in CNS of rats 4 days after injections of the Bartha strain of pseudorabies virus (PRV) into the medial gastrocnemius (MG) muscle. Tissue sections were processed for immunohistochemical detection of PRV. Retrogradely labeled cells were identified in the ipsilateral MG motor(More)
Porcine reproductive and respiratory syndrome virus (PRRSV) contains the major glycoprotein, GP5, as well as three other minor glycoproteins, namely, GP2a, GP3, and GP4, on the virion envelope, all of which are required for generation of infectious virions. To study their interactions with each other and with the cellular receptor for PRRSV, we have cloned(More)
The suitability of a rabbit seizure model for studying the neuropathogenesis of bovine herpesvirus type 5 (BHV-5) encephalitis was evaluated. Intranasal administration of BHV-5 (strain TX89) together with intramuscular administration of dexamethasone produced seizures in 70% of rabbits tested and meningo-encephalitis in 100%. Infectious BHV-5 was(More)
Swinepox virus (SWPV), the sole member of the Suipoxvirus genus of the Poxviridae, is the etiologic agent of a worldwide disease specific for swine. Here we report the genomic sequence of SWPV. The 146-kbp SWPV genome consists of a central coding region bounded by identical 3.7-kbp inverted terminal repeats and contains 150 putative genes. Comparison of(More)
Passive administration of porcine reproductive and respiratory syndrome virus (PRRSV) neutralizing antibodies (NAbs) can effectively protect pigs against PRRSV infection. However, after PRRSV infection, pigs typically develop a weak and deferred NAb response. One major reason for such a meager NAb response is the phenomenon of glycan shielding involving(More)
MOTIVATION The extraordinary genetic and antigenic variability of RNA viruses is arguably the greatest challenge to the development of broadly effective vaccines. No single viral variant can induce sufficiently broad immunity, and incorporating all known naturally circulating variants into one multivalent vaccine is not feasible. Furthermore, no objective(More)
Distribution and characterization of interlukin-10 (IL-10)-secreting cells in lymphoid tissues of pigs naturally infected with porcine circovirus type 2 (PCV2) were evaluated in accordance with PCV2 antigen detection. After screening a total of 56 pigs showing the symptoms of postweaning multisystemic wasting syndrome (PMWS), 15 pigs were PCV2 positive and(More)