In the industrial pig farm for 26 thousand heads, the analysis of the influence of a forage factor on bacteria carriers of a uterine pig population in connection with mass morbidity of dairy piglets on anaerobic enterotoxemia is carried out. Actinobacillus pleuropneumonia, Pasteurella multocida, Clostridium perfringens, Neisseria spp., Candida albicans, Aspergillus niger which are able to form biofilms, were isolated from five samples of “SK-1” compound feed for pregnant sows and from the blood of animals (n=20) fed with this compound feed. The structural basis of the most stable biofilms in vitro were the aerobic fungi Aspergillus niger and Candida albicans. Biofilm-forming variants of these bacteria showed multidrug resistance to 30 antimicrobial drugs (synthetic penicillins, cephalosporins, fluoroquinolones, aminoglycosides, tetracyclines, combination drugs). Isolates of associative microflora isolated from the blood of sows were pathogenic for 30% of laboratory mice. It was found that probiotic agent No1 (composition based on Bischofite with probiotics) showed the universal bactericidal activity against the bacteria Actinobacillus pleuropneumonia, Pasteurella multocida, Clostridium perfringens, Neisseria spp.
The novel coronavirus SARS-CoV-2 that causes COVID-19 disease, was mainly described as a something extraordinary in media discourse. Its “unusual,” almost “mystical” properties have been constantly invented by world media sources since January 2020 thus far. Critical comparison of the real epidemiological, physical, chemical and biological properties of SARS-CoV-2 with most common causative agents of coronavirus family demonstrates that principles and techniques of laboratory diagnostics and prophylaxis of SARS-CoV-2 should be built only on the basis of evidence-based medicine, not on imaginary properties of the virus that were created with ideological purposes.
B.T. Stegniydocteur en sciences vétérinaires, académicien de l'Académie nationale des sciences d'Ukraine, directeur de l'Institut de médecine vétérinaire expérimentale et clinique (Kharkiv)
Research results and discussion. All vaccinated adult mouse (n=12) at contrast to unvaccinated (n=8) were alive after its inoculation with broth culture of Mannheimia haemolytica in dose 0.5 cm 3 (10 5 BC 50) during 1 month of trials. Level of vaccinated mouse seroconversion on PRRS, PCV-2 and bacterial antigens was 0; 1/2.30+0.11 and 1/351.00+5.73 (P<0.01), in correspondence. All vaccinated pigs (n=5) after first injection had a levels of seroconversion on PRRS, PCV-2 and bacterial antigens (3 week after vaccination) 1/8.80+2.05; 1/22.50+7.73 and 1/51.00+6.88 (P<0.05), in correspondence. After revaccination (3 week after first injection) pigs had a levels of seroconversion on PRRS, PCV-2 and bacterial antigens (3 week after second injection) 1/17.40+0.78; 1/34.23+0.73 and 1/121.11+2.44 (P<0.05), in correspondence. Conclusions. Modified vaccine "ReproSuiVac-IECVM" are ready to clinical trials against the concurrent ASF-hemolytic pasteurellosis infections that promote of blind spreading of ASF agent in the quarantine areas of ASF outbreaks (promote of its attribution) in Ukraine.
The paper presents the results on the species and percentage composition of the microflora in biofilms of pig feed, which varies depending on the seasonal factor. Bacteria Streptococcus spp., Pasteurella multocida, Neisseria spp., and Clostridium perfringens in biofilms were found much more often (by 25% or more) in the warm period of the year, while listeria in silage and haylage — in the autumn–winter period. This property of feed biofilms is also significantly influenced by the conditions of cultivation, harvesting and storage of agricultural products. In the study of biofilms of microflora of barley, corn and wheat, it was found that their structural basis are aerobic fungi of the mold Aspergillus spp. Bacteria Streptococcus spp., Pasteurella multocida, Neisseria spp., and Clostridium perfringens without mold form much looser biofilms in vitro and these biofilms are much more sensitive to a wide range of commercial antibiotics. The structural basis of polymicrobial biofilms of barley, corn and wheat microflora is highly likely to be aerobic fungi of Aspergillus spp.
Veterinary drug AmixinR, active substance dihydrochloride 2,7-bis[2-(diethylamine)ethoxy]fluorene-9-one (AMX), was tested for its antiviral activity with using of the epizootic relevance for Ukraine the infectious agents of Pseudorabies (PR), Teschovirus encephalomyelitis (TEM), classical swine fever (CSF), porcine reproductive and respiratory syndrome pigs (PRRS), 2nd type of porcine circovirus (PCV-2) and parvovirus infections (PPVI), swine (SIV) and avian influenza viruses (AIV). The influence of this drug on agents of the avian mycoplasmosis (Myc) and pasteurellosis (Past) was also learned. AMX action was tested in the concentrations of 0.5–15 mg/ml, expositions for 0.25–12 hours and at the room temperature. Under these conditions, the inactivation of 20–60% (the highest concentrations more likely) the 1000 infectious units (TCID, ELD or PFU50/ml, respectively) of all viruses was resulted. The 5000 ELD50/ml of the SIV and AIV viruses were inactivated for 5 hours almost totally. Moderate toxicity of AMX was registered in it doses ≥1 mg/ml (P≤0.01) for tube cultures of PK-15 cell line and Marc-145. At the same time AMX doses ≥0.125 mg/ml inhibited by 20–75% of infective activities of agents of the PR, PRRS, PCV-2, PPVI (n=42, P≤0.01) in cell cultures Marc-145 and PK-15, respectively. The toxicity of the drug for 7–9-days-old embryos chickens began to emerge with a concentration of 1.5 mg/ml (n=18, P≤0.01). Its virostatic effect on SIV, AIV and PR agents was manifested in doses ≥0.25 mg/ml (n=24, P≤0.01). AMX was administrated in a single dose of 540 mg ana partes with sunflower oil and showed no toxicity for suckling piglets (n=4, P≤0.01) and 10-days-old chickens (n=10, P≤0.005). At the same time the antibiotic resistant Myc and Past from the blood of chicken infected by natural mixes of these agents, acquire the sensitivity to commercial food antibiotic after 5-days course of treatment by AMX. These data is interpreted the mechanism of therapeutic and preventive action of AMX through direct antivirus activity. The hypothesis of acquires the antibiotic sensitivity by pathogenic bacteria throughout its bacteriophages inhibition is proposed.
Pasteurella multocida (46.0%), Neisseria spp. (44.0%), Aspergillus fumigatus (10.0%) were isolated in stable consortia form from milk samples (n = 60) from cows in 6 herds (n = 627 heads) with clinical signs of immunodeficiency status. The bacteria of these consortia is strong resistant to lots of antibiotics from synthetic penicillin group (ampiox, amoxiclav, ampicillinum), cephalosporins (cefalexin, cefixime), and macrolides (macropene, tylosin). The etiological structure of bacterial infections in cattle and their calves (n = 57) in mentioned farm holdings of eastern Ukraine was determined (6 farms in 3 regions). In the majority of these livestock, respiratory syndrome has been recorded for a long time in 56.0% of calves from 20 days to 5 months old. The signs of diarrhea were revealed in 12.0% of lactating and dry cows of these livestock, 18.0% of these animals showed the clinical manifestation of mastitis and 9.0% of them had the diarrhea syndrome. Pasteurella multocida (48.0%), Mycoplasma bovis (32.0%), Neisseria spp. (12.0%), Clostridium perfringens (8.0%) were identified using microbiological methods from nasal and rectal swabs from calves of different age groups, from cows with clinical signs of mastitis were isolated Mycoplasma bovis (50.0%), Pasteurella multocida (34.0%), Neisseria spp. (16.0%). Pasteurella multocida, Neisseria spp. and Clostridium perfringens isolates showed strong resistance to ampiox, amoxiclav, ampicillinum, cefalexin, cefixime, macropene, and tylosin. It was concluded that mentioned multidrug-resistant animal infectious agents in human food chain could be a sources of antibiotic resistance genes for human pathogens.
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