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Shafiq, Muhammad Hassan,Kamble, Nitin M.,Kim, Tae Hoon,Choi, Yoonyoung,Lee, John Hwa BioOne (American Association of Avian Pathologists 2015 Avian diseases Vol.59 No.4
<P>Live attenuated vaccines are used for effective protection against fowl typhoid (FT) in domestic poultry. In this study, a lon/cpxR/asd deletion mutant of Salmonella Gallinarum expressing the B subunit of a heat labile toxin (LTB) from Escherichia coli, a known adjuvant, was cloned in a recombinant p15A ori plasmid, JOL1355, and evaluated as a vaccine candidate in chickens. The plasmid was shown to be stable inside the attenuated Salmonella Gallinarum cell after three successive generations. Moreover, from an environmental safety point of view, apart from day 1 the JOL1355 strain was not detected in feces through day 21 postinoculation. For the efficacy of JOL1355, a total of 100 chickens were equally divided into two groups. Group A (control) chickens were intramuscularly inoculated with phosphate-buffered saline at 4 and 8 wk of age. Group B chickens were primed and boosted via the intramuscular route with 200 mL of a bacterial suspension of JOL1355 containing 1 3 10 8 colony forming units. All the chickens in Group A and B were challenged at 3 wk postbooster by oral inoculation with a wild-type Salmonella Gallinarum strain, JOL420. The JOL1355-immunized group showed significant protection and survival against the virulent challenge compared to the nonimmunized group. In addition, Group B exhibited a significantly higher humoral immune response, and the chickens remained healthy without any symptoms of anorexia, diarrhea, or depression. Group B also exhibited a significantly lower mortality rate of 4% compared to the 46% of the control group, which can be attributed to higher immunogenicity and better protection. The Group B chickens had significantly lower lesion scores for affected organs, such as the liver and spleen, compared to those of the control chickens (P < 0.01). These findings suggest that JOL1355 is a promising candidate for a safe and highly immunogenic vaccine against FT.</P>
Pemphigus-Like Immune-Mediated Dermatosis in a Korean Native Black-Bone Fowl
Han, Jae-Ik,Mo, In-Pil,Na, Ki-Jeong BioOne (American Association of Avian Pathologists 2008 Avian diseases Vol.52 No.4
<P>A 3-yr-old female Korean native black-bone fowl weighing 1 kg presented with refractory dermatosis characterized by hyperkeratosis and alopecia on the head, neck, and scapular region. Antibiotic therapy before referral had not reduced the severity of lesions. Histopathologic findings revealed hyperkeratosis, acantholysis, heterophil infiltration, and ballooning degeneration in the epidermis. Immunohistochemical analysis showed immunoglobulin G deposits in the intercellular spaces of the intermediate layer of the epidermis. Based on these observations, this case was diagnosed as a pemphigus-like immune-mediated dermatosis. The administration of prednisolone eliminated the lesions, and the feathers grew back partially.</P>