Antimicrobial Susceptibilities of Clinical Nocardia Isolates Identified By 16S Rrna Gene Sequence Analysis

Nocardia species are ubiquitous in the environment and responsible for various human infections such as pulmonary, cutaneous, central nervous system and disseminated nocardiosis. Since the clinical pictures and antimicrobial susceptibilities of Nocardia species exhibit variability, susceptibility testing is recommended for every Nocardia isolates. The aims of this study was to determine the antimicrobial susceptibilities of Nocardia clinical isolates and to compare the results of broth microdilution and disc diffusion susceptibility tests. A total of 45 clinical Nocardia isolates (isolated from 17 respiratory tract, 8 brain abscess, 7 pus, 3 skin, 3 conjunctiva, 2 blood, 2 tissue, 2 pleural fluid and 1 cerebrospinal fluid samples) were identified by using conventional methods and 16S rRNA gene sequence analysis. Susceptibility testing was performed for amikacin, ciprofloxacin, ceftriaxone, linezolid and trimethoprim-sulfamethoxazole (TMP-SMX) by broth microdilution method according to the Clinical and Laboratory Standards Institute (CLSI) criteria recommended in 2011 approved standard (M24-A2) and disk diffusion method used as an alternative comparative susceptibility testing method. Among the 45 Nocardia strains, N.cyriacigeorgica (n: 26, 57.8%) was the most common species, followed by N.farcinica (n: 12, 26.7%), N.otitiscaviarum (n: 4, 8.9%), N.asteroides (n: 1, 2.2%), N.neocaledoniensis (n: 1, 2.2%) and N.abscessus (n: 1, 2.2%). Amikacin and linezolid were the only two antimicrobials to which all isolates were susceptible for both broth microdilution and disk diffusion tests. In broth microdilution test, resistance rates to TMP-SMX, ceftriaxone and ciprofloxacin were found as 15.6%, 37.8% and 84.4% respectively, whereas in the disk diffusion test, the highest resistance rate was observed against ciprofloxacin (n: 33, 73.3%), followed by TMP-SMX (n: 22, 48.9%) and ceftriaxone (n: 15, 33.3%). In both of these tests, N.cyriacigeorgica was the species with the highest resistance to ciprofloxacin (n: 25, 96.2%). When the susceptibility test results were compared, amikacin (kappa=1), linezolid (kappa=1), and ceftriaxone (kappa=0.903) showed very good agreement, whereas ciprofloxacin showed good agreement (kappa=0.672). For TMP-SMX no agreement was found between the two test methods (kappa=0.092). In conclusion, due to the identification of different species with molecular methods and increased frequency of Nocardia infections in recent years, in vitro susceptibility testing for Nocardia species is important to guide the appropriate antimicrobial treatment.WoSScopusTr-Dizi

Diagnosis of Mycoplasma bovis Infection in Cattle by ELISA and PCR

Mustak, Hamit Kaan/0000-0002-3694-1959; Akan, Mehmet/0000-0002-7342-1450WOS: 000333080000013Mycoplasma bovis is one of the most pathogenic agents in Mycoplasma species that cause disease in cattle. Particularly, young calves less than 4 month age are at considerable risk for pneumonia caused by M. bovis. In this study, we investigated M. bovis from tracheal swabs and blood sera of cattle which were showed respiratory symptoms. A total of 127 tracheal swab samples were collected from seven different farms in Turkey. In addition, total 254 acute and convelance sera were collected from same cattle intervals 15 days. The materials were collected from cattle in 3-12 months of age that reported respiratory problems such as broncho-pneumonia with coughing, depression, letargy and fever. Mycoplasma bovis was investigated in tracheal swab samples and sera collected from cattle by using PCR and ELISA respectively. The PCR results showed that M. bovis infections were positive in 4 different farms. The rates ranged from 5.3% (1/19) to 37.5% (6/16). Out of the 127 cattle examined, 45 (35.4%) were positive for M. bovis antibodies, while 82 (64.6%) were found to be negative. All PCR positive cattle were also found to be positive by ELISA. M. bovis infections were positive in all farms and the ELISA positive rates ranged from 20% (2/10) to 68.8% (11/16). Considering these results, in especially chronic infections, ELISA is a more useful method than PCR to detect M. bovis infection

Extended spectrum beta-lactamase activity and multidrug resistance of Salmonella serovars isolated from chicken carcasses from different regions of Turkey

This research was conducted to investigate the extended spectrum beta-lactamase activity and multidrug resistance of Salmonella serovars isolated from chicken carcasses. For this purpose, 99 Salmonella isolates from 930 chicken carcasses were tested against 12 different antimicrobials. The resistance rates of Salmonella isolates to antimicrobials were as follows: 35.3% (35/99) to ampicillin, 33.3% (33/99) to tetracycline, 29.2% to amoxicillin-clavulanic acid, 18.1% (18/99) to nalidixic acid, 17.1% (17/99) to chloramphenicol, 16.1% (16/99) to aztreonam, 12.1% (12/99) to trimethoprim-sulfamethoxazole, 4% (4/99) to gentamicin, 1.0% (1/99) to ceftazidime. Of the isolates 46.4% (46/99) were found to be resistant to two or more antimicrobials as a multidrug resistance. Extended spectrum beta-lactamase activity was detected in 1.0% (1/99) of the isolates. Furthermore, S. Typhimurium 26.2% (28/99), S. Infantis 16.1% (16/99), S. Hadar 12.1% (10/99) and S. Branderburg 9.0% (9/99) were found to be the predominant serovars. In conclusion, antimicrobial resistance and also multidrug resistance rates of Salmonella isolates in this study, indicated that monitoring of antimicrobial resistance profiles is important for Salmonella infections to plan treatment strategies

The prevalence of major foodborne pathogens in ready-to-eat chicken meat samples sold in retail markets in Turkey and the molecular characterization of the recovered isolates

The aims of the present study were to evaluate the prevalence of Arcobacter spp., Campylobacter spp., Listeria spp., and Salmonella spp. in heat-processed ready-to-eat (RTE) chicken products manufactured by various companies using, bacterial culture methods and to perform virulence gene analysis, serotyping, genotyping, and antibacterial susceptibility tests on the isolated strains. For this purpose, 50 packages of chicken convenience products were used as the study material. Phenotypic tests and a molecular method (Polymerase Chain Reaction, PCR) were used to identify the isolated bacteria. All samples examined were negative for Arcobacter spp., Campylobacter spp., and Salmonella species. Listeria species were isolated from 12 (24%) of the examined samples. Among the Listeria species isolated, 9 were identified as L. monocytogenes, 2 were identified as L. innocua, and one was identified as L. welshimeri. All isolates were susceptible to the antibiotics tested. A detailed molecular analysis of the Listeria spp. revealed that the examined food products posed a significant public health hazard. Considering the presence of different genotypes of L. monocytogenes in RTE food production facilities, all the steps of food production must be reviewed in terms of conformity with sanitation and hygiene rules, and necessary measures must be set in place. (C) 2017 Elsevier Ltd. All rights reserved

Pathogenicity, genotyping and antibacterial susceptibility of the Listeria spp. recovered from stray dogs

The present study aimed to determine the prevalence of Listeria spp. in stray dogs in the Kayseri province of Turkey. In addition, serotyping, genotyping and virulence gene analysis of the isolated Listeria spp. were performed and their pathogenicity and antibacterial susceptibility were investigated

Base study for the establishment of national Salmonella control program in hatching farms and table eggs in Turkey

WOS: 000523562000023Foodborne infections due to Salmonella are still a major concern worldwide. Particularly contaminated egg and egg related products are the primary sources for human salmonellosis. It is necessary to determine the risk factors associated with Salmonella contamination of eggs within the scope of farm to table and environment. The objective of this study was to develop the "National Salmonella Control Program in Laying Hens" and report the prevalence and serotype distribution findings of Salmonella in laying hens and eggs in Turkey. A total of 2122 samples were collected and analysed according to ISO 6579:2002 after the isolation and identification procedures. All Salmonella isolates were serotyped including 726 eggs and 1396 farm specimens from 241 epidemiological units (EpUs) that were located in 9 different provinces between 2015 and 2017. Salmonella contamination was detected in 14.9% of 241 EpUs. The results indicated that almost half of the flocks have multiple contamination sources. The highest contamination rate was obtained from environmental (11%) followed by faeces (7.5%) and the lowest was from water samples (1.6%). The overall contamination rate was detected as 7.46% for farms and 3.3% for eggs. As S. Enteritidis and S. Typhimurium are the most frequently seen serotypes all over the world, in Turkey S. Typhimurium was not detected and S. Enteritidis was the 5th most common isolated serotype. According to our results it can be concluded that differences in various countries, particularly geographical and egg hatching systems, may affect the contamination rate and serotype distribution of Salmonella.Scientific and Technological Research Council of Turkey (TUBITAK)Turkiye Bilimsel ve Teknolojik Arastirma Kurumu (TUBITAK) [113R036, 113R037]The part of this study was supported by a grant of The Scientific and Technological Research Council of Turkey (TUBITAK-project numbers as; 113R036 and 113R037)

Neonatal calf meningitis associated with Streptococcus gallolyticus subsp. gallolyticus

Here, we report a case of neonatal calf meningitis due to Streptococcus gallolyticus subsp. gallolyticus (SGG). Clinical, pathological and microbiological findings were evaluated. API Strep, 16S rRNA gene sequencing, rpoB gene sequencing and sodA gene sequencing were used for the complete identification of SGG. This is the first documented report of neonatal calf meningitis due to SGG in veterinary medicine