The aim of this study were to detect the gyrA, parC and marR mutations and qnr genes (qnrA, qnrB and qnrS) in 120 strains of Escherichia coli isolated from animals. European Committee on Antimicrobial Susceptibility Testing and Clinical Laboratory Standards Institute disc diffusion and minimum inhibitory concentration (MIC) tests, respectively, were used to determine fluoroquinolone (FQ) resistance, and molecular methods were used to detect the mutations and the genes. E coli isolates with an MIC of ≥8 mg/l had mutation at Ser-80 in parC in addition to mutations at Ser-83, Asp-87 or both in gyrA. The nucleotide change was detected in marR (Ser-3 → Asn, Ala-53 → Glu, Gly-103 → Ser, Tyr-137 → His). Only four E coli isolates (3.3 per cent) contained qnrA and qnrS, and qnrB was not detected. Two E coli isolates from healthy calves also contained qnrA and qnrS. The MICs of enrofloxacin and danofloxacin for qnr-containing E coli isolates ranged from 32 mg/l to 256 mg/l. The results of this study indicated that the FQ-resistant E coli isolates presented an alteration in gyrA (Ser-83 → Leu, Asp-87 → Asn) and parC (Ser-80 → Ile) with high MICs (8-256 mg/l), and there was a low prevalence of qnr genes among E coli isolated from animals.
Respiratory tract disease is the second most common cause of poor performance in racehorses after musculoskeletal disease. Lower respiratory tract disorders (LRTD) are common in thoroughbred horses of all ages. The aim of this study was to investigate whether there was any association between the microbiological and cytological examinations. Fifty horses ranging in age from 2 to 6 years were examined. Horses with only upper respiratory tract abnormalities identified by endoscopy (at rest) were eliminated from the study and horses with LRTD were used in this study. Tracheal aspirate specimens were collected for cytological and microbiological examinations. Thirty six horses had positive and 14 horses had negative cultivation. The isolated bacteria included β-haemolytic Streptococcus equi subsp. zooepidemicus (38.8%), Escherichia coli (22.2%) and other bacteria that were isolated at rates ranging from 0.4 to 1.8%. Percentages of neutrophils, lymphocytes, eosinophils, macrophages and mast cells were evaluated in the cytological examination. The percentages of neutrophils were significantly higher in the samples with isolated bacteria (35.75 ± 2.60%) compared to the samples from which bacteria were not isolated (16.79 ± 2.36%) (P < 0.001). This study shows that S. equi subsp. zooepidemicus could play an important role in the etiopathogenesis of LRTD. It also demonstrates the importance of evaluating the microbiological findings of the tracheal aspirate specimens from horses suffering from respiratory infections, in addition to performing a detailed clinical examination and other complementary tests that focus on the respiratory system, such as endoscopy and cytology of the tracheal aspiration.
Investigation of Contagious Agalactia by Bacteriological and PCR Methods in Sheep and Goats AbstractThe aim of this study was diagnosis that occurrence of Contagious Agalactia by bacteriological and molecular methods in sheep and goats. A total of 339 samples from sheep and goats in Bursa, Balıkesir, Çanakkale and Edirne provinces were examined by bacteriological and molecular methods. The samples were 162 milk samples,147 eye swabs, 15 joint fluids, 11 nasal swabs and 4 lung tissue. In bacteriological examination, 29 isolates were evaluated as Mycoplasma sp.. As a result of biochemical tests and growth inhibition tests, 29 (8.55%) Mycoplasma sp. were identified as 25 (7.37%) Mycoplasma agalactiae, 2 (0.58%) Mycoplasma ovipneumoniae and 2 (0.58%) Mycoplasma arginini. In molecular diagnosis, polC gene-PCR results could be detected M. agalactiae positive with 9.14% rate. As a result of this, 5 milk samples and 1 lung tissue sample were detected positive by polC-PCR while negative by bacteriological examination. The results of polC-PCR detected M. agalactiae positive with 14.19% rate of milk samples, 13.33% rate of joint fluids, 2.72% rate of eye swabs and 50% rate of lung tissue samples but nasal swabs were detected as negative. In this study, presence of Contagious Agalactia were investigated by bacteriological and molecular methods and M. agalactiae was detected as a main agent which cause disease however other Mycoplasma species which cause disease were not observed.
Mycoplasma species are a major cause of mastitis, arthritis, pneumonia and reproductive disorders in small ruminants. Mycoplasmas in reproductive systems of males have been associated with diseases as orchitis, balanoposthitis and abnormal spermatozoa activity. The aim of this study was to detect Mycoplasma species that cause reproductive infections in bucks and rams. Total of 27 preputial swabs was collected from Saanen bucks and Kıvırcık rams at the Artificial Insemination (AI) Center of Uludag University in Turkey. Bacteriological culture methods, followed by Polymerase Chain Reaction (PCR) and Denaturing Gradient Gel Electrophoresis (DGGE) were used to detect and identify Mycoplasma species. The PCR-DGGE method identified one M. bovigenitalium and one M. arginini from two cases of orchitis in rams, and another M. bovigenitalium was identified from a buck with no clinical signs. The results showed that Mycoplasma species were present in the testicles of rams and bucks that were negative for Brucellosis, and likely causative organisms of orchitis which lead to reduced fertility.
Bu çalışmada, Tekirdağ ilinde bir tavuk çiftliğinde saptanan Corynebacterium ve Arcanobacterium spp. enfeksiyon olgusu sunuldu. Tekirdağ Namık Kemal Üniversitesi Veteriner Fakültesi Mikrobiyoloji Anabilim Dalı Laboratuvarına gözde tek taraflı şiddetli keratokonjunktivitise bağlı kapanma, yüzde ödem ve solunum güçlüğü şikâyetiyle getirilen bir tavuğa nekropsi yapıldı. Tavuğun gözünden alınan irin ve diğer nekropsi materyallerinden (akciğer, kalp, karaciğer,dalak) uygun besi yerlerine ekimler yapıldı. İzole edilen bakterilerin identifikasyonu amacıyla rutin biyokimyasal testler uygulandı. Nekropsi makrsoskobik incelemede; gözün tamamen kapandığı ve içerisinin irinle dolu olduğu, akciğerde konjeste alanlar ve multifokal renk değişimleri ile kalpte hafif bir büyüme gözlendi. Materyallerden yapılan ekimlerde Columbia agar (%5 koyun kanlı) ve Tryptic Soy agarda üreme olurken, Mac Conkey ve Eosin Methylene Blue agarda üreme görülmedi. Karaciğer ve dalaktan yapılan ekimlerde üreme olmadı. Gram boyamada Gram pozitif çomaklar ve kokobasiller tespit edildi. Biyokimyasal testlerle; gözden alınan irinden Corynebacterium spp., akciğerden alınan örnekten Arcanobacterium spp. ve kalpten alınan örnekten Corynebacterium spp. izole ve identifiye edildi. İzole edilen bu etkenler kanatlı hayvan türleri için potansiyel hastalık riski oluşturması açısından kayda değer bulundu.
The aim of this study was to reveal the milk components and the changes in their characteristics in Damascus goats during the early postpartum period. For this purpose, 50 Damascus goats (aged 2 to 8 years) were selected for this study. A total of 291 milk samples were collected under sterile conditions during the mornings of the 10th, 20th and 30th days postpartum. Results were statistically analysed using the Mann-Whitney U Test and repeated measures ANOVA. All collected samples were analysed for milk composition (lactose (L), protein (P), casein (C), fat (F), total solid (TS), solid not fat (SNF), freezing point (FP), acidity (A), density (D), free fatty acid (FFA), and citric acid (CA)). A significant decrease was detected in P, C, F, TS and SNF values between the 10th and 30th days postpartum (pp) (P <0.01). Similar results were also observed in FP, A, D and CA values between the same days (P <0.05; P <0.01). A significant positive correlation was detected between FP, A, P, C, F and TS (0.812 and 0.980; P<0.05 and P<0.01). Additionally, a correlation was detected between C and P (0.983; P <0.01). These results reveal that these parameters decreased significantly in the early puerperal period compared to the first 10 days, and these decreases were not associated with an increase during milk yield in the early period of lactation (up to the 30th-day pp).
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