Boron (B) compounds are used in many fields ranging from medicine to industry. In this study, boric acid (BA) and disodium octaborate tetrahydrate (DOT) were evaluated for their antibacterial effects and antibiofilm capacities on selected strains of clinical and type cultures that are of veterinary concern (Staphylococcus aureus ATCC 25923, Aeromonas hydrophila ATCC 19570, Pseudomonas aeruginosa ATCC 27853, Brucella melitensis Rev1 and field isolates of Vibrio anguillarum, Aeromonas hydrophila, Yersinia ruckeri, Pseudomonas aeruginosa, Lactococcus garvieae, and Brucella abortus). Also, the inhibition of biofilm was monitored by scanning electron microscopy. The lowest MIC values of BA and DOT were measured, by broth method using microdilution, from Pseudomonas aeruginosa ATCC 27853, and were 0.385 and 0.644 mg/ml, respectively. Staphylococcus aureus was the most resistant to both BA and DOT. Using the microplate method, we observed that the strongest positivities for biofilm production were presented by Pseudomonas aeruginosa ATCC 27853 and also a clinical isolate of Lactococcus garviea. Lower values in the MIC scores for both B compounds were tested by measuring the inhibitory effect on biofilm production. We found that all the bacterial strains inhibited biofilm formation with the exception of the Pseudomonas aeruginosa strains for BA only and an isolate of Lactococcus garviea for DOT only. Such effects by BA and DOT are worth discussing in order to find novel approaches for different functions in medicine and industry using the bacteria tested.

This study aimed to determine the effectiveness of a pregnant mare immunization of a Rhodococcus equi (R. equi) vaccine candidate containing a water-based nanoparticle mineral oil adjuvanted (Montanide IMS 3012) inactive bacterin and virulence-associated protein A (VapA), as well as the administration of anti-R. equi hyperimmune (HI) plasma against R. equi challenge in the mares' foals. The efficacy of passive immunizations (colostral passive immunity by mare vaccination and artificial passive immunity by HI plasma administration) was evaluated based on clinical signs, complete blood count, blood gas analysis, serological response (ELISA), interleukin-4 (IL-4) and interferon gamma (IFN-γ), total cell count of the bronchoalveolar lavage fluids (BALF) samples, reisolation rate of R. equi from BALF samples (CFU/mL), lung samples (CFU/gr), and lesion scores of the organs and tissue according to pathological findings after necropsy in the foals. The vaccination of pregnant mares and HI plasma administration in the foals reduced the severity of R. equi pneumonia and lesion scores of the organs and tissue by 3.54-fold compared to the control foals. This study thus indicates that immunization of pregnant mares with R. equi vaccine candidate and administration of HI plasma in mares' foals effectively protect foals against R. equi challenge.

IntroductionSalmonellosis is a common bacterial enteric infection with significant economic losses for the intensive production of cattle, sheep, and poultry (1,2). Salmonella species are zoonotic and are transmitted to humans via ingestion of contaminated milk, eggs, and meat (3,4). Although Salmonella infections may occur at any age in cattle, the associated clinical symptoms are more severe in calves from the first 2 weeks to 3 months of their life (5,6).Salmonella enterica subsp. enterica may cause infections associated with several clinical symptoms or systemic infections characterized by diarrhea and septicemia and may even lead to death in severe cases. It can be harbored by asymptomatic carriers (2,5). In the enteric form of salmonellosis, the stool is sticky and watery and has a putrid odor. It may contain flecks of mucus, shreds of the mucous membrane, and in some cases blood. Young calves and lambs frequently develop septicemia. Furthermore, marked depression, fever, symptoms of the central nervous system, pneumonia, and death within 2-3 days can also occur (7-9). Clinical symptoms and necropsy findings alone are not sufficient for a definitive diagnosis of Salmonella infection. It is imperative to isolate and identify the causative Salmonella species (10-12). While the isolation of Salmonella is relatively easy via bacterial culture from samples taken from animals with septicemia, carcasses, and the organs of aborted fetuses, enrichment is needed to increase the chance of isolating Salmonella from feed samples or from fecal cultures used to detect carriers (7,13,14).This study aimed to isolate and serotype Salmonella species from fecal samples of dairy cattle, calves with diarrhea, camels, and water buffaloes and to determine sensitivities of the isolates to antibiotics. Materials and methods SamplingA total of 869 fecal samples were collected from 21 herds in 13 provinces (Konya,

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