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Determination of antimicrobial susceptibility and virulence-related genes of Trueperella pyogenes strains isolated from various clinical specimens in animals

100%
Gulaydin O., Kayikci C., Gulaydin A.
Polish Journal of Veterinary Sciences
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2024
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tom 27
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nr 2
In this study, a total of 32 Trueperella pyogenes strains isolated from different disease specimens in cattle, sheep and goats were examined. Antimicrobial susceptibility of the isolates to 10 antimicrobials were determined using the E-test method and MIC values of the antimicrobials were investigated. The genes that play a role in the antimicrobial resistance or virulence of T. pyogenes were determined by PCR using gene specific primers. In the study, all the isolates were susceptible to penicillin and cephalosporin. The highest resistance rate in the isolates was determined against streptomycin (56.25%) and tetracycline (53.12%) and MIC90 values for these antimicrobials were found to be >256 μg/ml and 12 μg/ml, respectively. The ermX gene was found to be positive in 8 (80%) of 10 isolates that were resistant to macrolide group antimicrobials. Among 20 aminoglycoside resistant isolates, aadA1, aadA9, strA-strB, and aac(6’)-aph(2’’) genes were determined in 5 (25%), 14 (70%), 7 (35%) and 1 (5%) of the isolates, respectively. When the presence of virulence-related genes in the isolates was examined, nanP (93.75%), fimA (93.75%) and plo (90.62%) genes were detected in the majority of the isolates. While the cbpA gene was negative in all isolates, the fimG gene was found in a limited number of the isolates (15.62%). It was concluded that streptomycin and tetracycline resistance should be considered in T. pyogenes isolates. Also, nanP, fimA and plo genes may have an important role in the pathogenesis of the infections.
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Investigation of the presence of Chlamydia spp., Mycoplasma spp. and Moraxella ovis in infectious keratoconjunctivitis cases in sheep and goats in Siirt province and evaluation of clinical findings

88%
Gulaydin A., Gulaydin O., Akgul M. B., Sindak N., Yildirim O.
Polish Journal of Veterinary Sciences
|
2024
|
tom 27
|
nr 2
Infectious keratoconjunctivitis is an infectious disease that negatively affects animal welfare causing systemic or local clinical signs in small ruminants and causes significant economic losses in herds. It is important to determine the etiologic agent causing the infection in the development of the protection and control strategies against the disease. The aim of this study was to determine the presence of infectious keratoconjunctivitis cases in small ruminants raised in Siirt province in Türkiye. Infectious keratoconjunctivitis was graded according to the symptoms determined by clinical examination. The presence of Chlamydia spp., Mycoplasma spp. and Moraxella ovis was investigated by PCR in swab samples obtained from the animals with keratoconjunctivitis. Infectious keratoconjunctivitis was detected in 263 (19.86%) of 1324 animals examined in the study. Of the animals with infectious keratoconjunctivitis, 163 (61.97%) were sheep and 100 (38.02%) were goats. The detection rate of infectious keratoconjunctivitis was higher in sheep than goats. In 56 (21.29%), 109 (41.44%), 67 (25.47%), and 31 (11.78%) of the cases, findings of stage 1, 2, 3, and 4 infectious keratoconjunctivitis were detected, respectively. Of the eye swab samples taken from 263 animals with infectious keratoconjunctivitis, 5 (1.90%) were positive for Mycoplasma spp. and 6 (2.28%) were positive for M. ovis. It was determined that the distribution of the bacterial agents varied according to the stage of infectious keratoconjunctivitis. No statistically significant correlation was found in the distribution of bacterial agents among identified samples according to species, sex, age, and infectious keratoconjunctivitis stage of the animals. It was thought that the data obtained in the study would contribute to the studies for protection and control by determining the incidence and aetiology of infectious keratoconjunctivitis cases observed in small ruminants.
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