Vaccine efficacy and immune response to swine influenza virus challenge in pigs infected with porcine reproductive and respiratory syndrome virus at the time of SIV vaccination.

The objective of this study was to assess the effect of concurrent infection with porcine reproductive and respiratory syndrome virus (PRRSV) on the efficacy of an inactivated swine influenza virus (SIV) vaccine. Eight groups of pigs were infected with a virulent PRRSV isolate either between the two SIV vaccines or at the time of SIV challenge. Control groups included SIV vaccination without PRRSV and pigs infected with SIV and/or PRRSV.

Effectiveness of transdermal, needle-free injections for reducing pork carcass defects.

A needle-free, transdermal injection device was evaluated for effectiveness of vaccine delivery and for injection site lesions in swine. A total of 130 pigs were vaccinated for pseudorabies virus (PRV) and Mycoplasma hyopneumoniae (M. hyopneumoniae).

Impact of immunizations with porcine reproductive and respiratory syndrome virus on lymphoproliferative recall responses of CD8+ T cells.

The objective of this study was to investigate the immune responses elicited by either a modified-live (MLV) or a killed virus (KV) porcine reproductive and respiratory syndrome virus (PRRSV) vaccine. Specifically, we investigated the effects of multiple vaccinations on antigen-specific cellular and antibody responses against PRRSV. Twelve sows were obtained from herds with either a history of repeated MLV or KV PRRSV vaccination and a non-vaccinated, PRRSV-negative herd.

Experimental infection of pregnant gilts with swine hepatitis E virus.

To determine the effect of swine hepatitis E virus (HEV) infection on pregnant gilts, their fetuses, and offspring, 12 gilts were intravenously inoculated with swine HEV. Six gilts, who were not inoculated, served as controls. All inoculated gilts became actively infected and shed HEV in feces, but vertical transmission was not detected in the fetuses.

Use of a Mycoplasma hyopneumoniae nested polymerase chain reaction test to determine the optimal sampling sites in swine.

A number of polymerase chain reaction (PCR)-based diagnostic tests have been developed for Mycoplasma hyopneumoniae, including one from this research group. This report presents further development, optimization, and standardization of a nested PCR test. Detection sensitivity was 1 fg of M.

Modified indirect porcine circovirus (PCV) type 2-based and recombinant capsid protein (ORF2)-based enzyme-linked immunosorbent assays for detection of antibodies to PCV.

Postweaning multisystemic wasting syndrome of swine associated with porcine circovirus (PCV) is a recently reported and economically important disease. Simple and reliable diagnostic methods are needed for detecting antibodies to PCV type 2 (PCV2) for monitoring of PCV infection. Here, we report the development of two modified indirect enzyme-linked immunosorbent assays (ELISAs): a PCV2 ELISA based on cell-culture-propagated PCV2 and an ORF2 ELISA based on recombinant major capsid protein.