The in vivo effects of a single prophylactic dose of recombinant bovine interferon (rBoIFN)-alphaI1 in calves with salmonellosis were investigated, using a Salmonella typhimurium infection model. Treatment with rBoIFN-alphaI1 reduced the degree of septicemia compared with that in control groups, and, in one experiment, using disease of reduced severity, body temperature was lower in treated calves than in controls.

We investigated the ability of an antibody-specific, O antigen-based ELISA to document Salmonella typhimurium herd infections by screening of milk samples. Three cattle populations, 20 herds with no history of salmonellosis, 8 herds with history of S. typhimurium episodes within the previous 7 months, and 220 herds of unknown disease status, were tested. A herd was considered ELISA positive if at least 5% of the cows had OD values > 0.3. Among the 20 herds without history of salmonellosis, only 2 herds were ELISA positive, whereas all 8 herds with a known history of salmonellosis were ELISA positive (herd specificity, 0.9 and herd sensitivity, 1.0). A significant correlation (P < 0.001) was found between the OD values of serum and milk samples from cows in the herds with a history of salmonellosis. It was concluded that ELISA testing of individual milk samples can be used for surveillance of herds for S. typhimurium infections, but further modifications are needed to test bulk tank milk samples.

A series of experiments was conducted to document tumor necrosis factor-alpha (TNF) activity in serum of swine after inoculation with Salmonella spp endotoxin and after oral or respiratory tract challenge exposure with live Salmonella spp. For experiment 1, a potentially lethal dose of S typhimurium endotoxin (25 microgram/kg of body weight) was administered IV, and serum TNF activity was measured. High TNF (approx 700 IU/ml) activity at 1 to 2 hours after administration of the inoculum was associated with death, whereas lower TNF (approx 30 IU/ml) activity was associated with a general prolonged state of shock. For experiment 2, pigs were administered a nonlethal dose (5 microgram/kg, IV) of either S typhimurium or S choleraesuis endotoxin. Difference in the ability to induce porcine serum TNF activity was not observed between strains. During experiment 3, pigs were inoculated with 104 colony-forming units of S typhimurium chi4232 either orally by gelatin capsule (GC) or by intranasal (IN) instillation. A late serum TNF response (17 IU/ml) was measured at 6 weeks after IN inoculation. A serum TNF response was not detected in GC-inoculated pigs. All tissues and feces were test-negative for S typhimurium prior to the 6-week TNF response. Serum TNF activity may be related to clearance of S typhimurium after respiratory tract exposure, but it is not important to or indicative of clearance of orally presented S typhimurium in swine. During experiment 4, pigs were inoculated with 106 colony-forming units of S typhimurium chi4232 similarly as for experiment 3. Challenge exposure with this medium-size dose of inoculum induced a prolonged peak serum TNF response (37 IU/ml) between 2 and 4 weeks after IN inoculation Again, serum TNF activity was not detected in GC-inoculated pigs. Data suggest that clearance of a medium-size dose (106) of inoculum may be influenced by the prolonged higher serum TNF activity. For experiments 5 and 6, pigs were inoculated IN with 103, 106, 108.

Salmonella (S.) Typhimurium is highly contagious, and its infection may rapidly spread within pig populations of herd. According to the survey (1,191 pigs) from 2003 to 2012, 155 pigs (13.0%) were diagnosed as salmonellosis in Jeju. Major porcine salmonellosis cases (88.4%) were concentrated in 4- to 12-week-old weaned pigs, but 6 pigs (3.9%) under 4 weeks old were also diagnosed. Based on the histopathologic examinations, ulcerative enteritis (63.9%) in the large intestine and/or paratyphoid nodules formation (57.4%) in the liver were most prevalent lesions in porcine salmonellosis. Single infection of S. Typhimurium and mixed infection with more than 2 pathogens were detected in 38 (24.5%) and 117 (75.5%) in pigs, respectively. Co-infections of Porcine reproductive and respiratory syndrome virus and Porcine circovirus type 2 were very common in porcine salmonellosis in Jeju and detected in 84 (54.2%) and 59 (38.1%) pigs, respectively. Based on the serotyping tests using 41 bacterial isolates, S. Typhimurium and S. Rissen were confirmed in 39 (95.1%) and 2 (4.9%) cases, respectively.

Results of studying of therapeutic efficiency of developed in the Republic of Belarus biological preparation of trial series against salmonellosis of animals and birds in the conditions of experimental salmonellosis of calves were presented. Research results showed that dualfold application of multivalent antitoxic serum against salmonellosis of calves, piglets and birds which was caused by association of S. Dublin, S. typhimurium, and S. enteritidis was accompanied by activation of humoral immunity. It was revealed in increasing of agglutinating activity of blood serum against S. enteritidis – in 11,5 times, against S. typhimurium – in 10,5 times, and against S. Dublin – in 10,0 times in 6 days after introduction of infection (4-th day after second application serum). Content of Ig M in blood serum calves which were treated with experimental serum increased in 2,0 times on the 6-th day after introduction of infection. Quantity of Ig G increased in 2,6 times by the 6-th day after introduction of infection. All these changes were typical for the clinical recovery of animals. Treatment efficiency of application of the analyzed serum was 75%

Experimental research on production of antigen preparation for hyperimmunization of bulls from blood of which it was possible to produce an active medical and preventive serum against cattle salmonellosis and pasteurellosis was realized in the conditions of the Republic of Belarus. There were developed four variants of antigen on the basis of the formolated aluminous concentrated vaccine against calf salmonellosis and on the basis of semiliquid aluminum hydroxide vaccine against cattle pesteurellosis. All obtained variants of associated antigen had concentration of hydrogen ions, which was close to the neutral rating; they were also sterile and safe for white mice. Associated antigen which was constructed from vaccines in the ratio of 1:1, 1:2, 1:3, and 2:3 had an ability to raise the protection of immunized experimental guinea pigs in the conditions of controlled introduction of infection with S. dublin 373 and S. tythimurium 371. Pasteurellosis component of associated antigen in 1:1 and 1:2 variants protected against death only 3 out of 5 immunized doves, both in relation to P. multocida strain N 796, and bacteria P. multocida strain N 5264. Vaccine ratio in the associated antigen 1:3 and 2:3 turned to be more immunogenically balanced: all tested doves survived after introduction of infection of broth culture P. multocida of N 796 and N 5264 strains. Experimental results showed that the associated antigen on the basis of vaccines in ratio of 1:3 was sterile, safe, active and suitable for hyperimmunization of bull producers serum against salmonellosis and pasteurellosis of calves, as well as antigen in the variant 2:3, but this ratio increased the expenses

Morphological and structural changes in bone marrow of piglets which were immunized with produced in the Republic of Belarus SPS vaccine (against salmonellosis (Salmonella), pasteurellosis (Pasteurella) and streptococcus) in combination with immunostimulants and without them were analyzed in the conditions of the Republic of Belarus. Piglets of the first group were vaccinated against salmonellosis, pasteurellosis and streptoccocusis by SPS vaccine. Piglets of the second group were vaccinated by SPS vaccine with vitamin C. Piglets of the third group were vaccinated by SPS vaccine with immunotstimulant sodium thiosulphate. The fourth (control) group of animals was administrated with normal saline. Animals were immunized twice, intramuscularly with 7 day interval in dose of 4 ml (primary), and 5 ml (secondary). Vitamin С was administrated in dose of 0,05g per head. Sodium thiosulfate was administrated in combination with the vaccine in 30% concentration. Alongside with myelogram there were derived formulas of different cell groups of bone marrow: leucoerythroblastic index; intramedullary index of neutrophil maturity; intramedullary index of eosinophile maturity. Detailed myelogram of piglets on the 14-th day after the second immunization was presented. Research results showed that in all groups of vaccinated animals there was noted the activation of myeloblastic hematogenesis and decreasing of erythropoeisis. Piglet immunization was accompanied by strengthening of myeloblastic hematogenesis, increased number of lymphocytes and plasma cells in bone marrow

Determination of a degree of manifestation of immunomorphological changes in immune system organs of piglets vaccinated against salmonellosis, pasteurellosis and streptoccocusis with SPS vaccine (against salmonellosis (Salmonella), pasteurellosis (Pasteurella) and streptococcus) in combination with immunostimulative drugs and without them was realized in the conditions of the Republic of Belarus. Piglets of 30-35 days old were divided into 4 groups according to the analogue principle. Piglets of the first group were vaccinated against salmonellosis, pasteurellosis and streptoccocusis by SPS vaccine. Piglets of the second group were vaccinated by SPS vaccine with vitamin C. Piglets of the third group were vaccinated by SPS vaccine with immunotstimulant sodium thiosulphate. The fourth (control) group of animals was administrated with normal saline. Animals were immunized twice, intramuscularly with 7 day interval in dose of 4 ml (primary), and 5 ml (secondary). Vitamin С was administrated in dose of 0,05g per head. Sodium thiosulfate was administrated in combination with the vaccine in 30% concentration. The research results showed that immunization with SPS vaccine in combination with sodium thiosulphate and vitamin С promoted the activation of morphological reactions in tissues at locus of vaccine administration, lymphodnudus and lien. Immunization of piglets by SPS vaccine with sodium thiosulphate and with vitamin С activated the limphiod, micro- and macrophage reactions at locus of vaccine administration, as well as in organs and cells there was stated the well-marked vitamin C and glycogen distribution. Sodium thiosulphate showed higher immunostimulate influence in comparison with vitamin C

In the conditions of the Republic of Belarus there was developed and a simple and applicable for industrial production method of immunoglobulin production against animal salmonellosis. The following initial raw materials were used for production of the specific immunoglobulin: blood serum of bulls which were hyperimmunized with formolated antigen on the basis of four serovars: S. typimurium; S. abortusovis; S. dublin; S. choleraesuis. In course of the study there were analyzed chemical and biological indexes of immunoglobulin of experimemtal series; determination of the preparation doses for white mice and pigeons. The experimental work on production of immunoglobulin against salmonellosis made it possible to develop a technological scheme of the analyzed preparation production. In course of the experiment there were found optimal conditions for serum fractionation; there were developed methods of its conservation, sterilization and quality control of the specific immunoglobulin.

Studying of cultural, morphological and enzymatic properties of isolated from a calf strain Salmonella enteritidis was realized in the conditions of the Republic of Belarus. There was presented quantity and results of bacteriologic examinations for cattle salmonellosis realized in the district veterinary services in Belarus in course of three years. There was presented quantity and results of serovars of salmonellas isolated from the pathologic material from cattle obtained in course of three-year analysis: S. typhimurium, S. enteritidis, S. dublin, S. panama. The following enzicymatic properties of the studied strain were analyzed: glucose, sucrose, manna sugar, citrate, methyl red, Voges-Proskauer reaction, mobility, indole, sulphuretted hydrogen, and urea. Determination of antibiotic susceptibility of strain S. enteritidis was presented. Initial data for calculation LD50 was given. Research results showed that the studied microorganisms were the representatives of family Enterobakteriacea, genus Salmonella, species S. enteritidis