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Articles by T. Zahraei Salehi
Total Records ( 5 ) for T. Zahraei Salehi
  T. Zahraei Salehi , M. Mahzounieh and A. Saeedzadeh
  The aims of this study were to isolation of Salmonella from poultry farms of Shiraz province of Iran and determination of their susceptibility against common antibiotics. One hundred and ninety two samples were harvested from intestine and liver of chickens and were aseptically cultured in enrichment and selective media. Out of 192 samples, 30 Salmonella were isolated. Four different serogroups were found among 30 Salmonella isolates. Strains of serogroup D1, which accounted for 70% of total isolates, were the most common isolates. PCR products of all isolated Salmonella showed a predicted 284 bp amplified DNA fragment of invA gene. All of 30 Salmonella strains were susceptible to the antimicrobial effect of Cephalothin, Tylosin, Colistin, Ciprofloxacin, Enrofloxacin, Gentamicin, Chloramphenicol, Cephalotin and Cefotaxime. But 20.7% of Salmonella strains were resistant to Trimethoprim, Nalidixic acid, Flumequine, Tetracycline and Neomycin, 24.2% to Streptomycin, 34.5% to Kanamycin and 13.8% to Amikacin.
  M. Mahzounieh , I. Karimi and T. Zahraei Salehi
  CIAV infection in chicken flocks has been described in most countries with a developed chicken industry and can result in economically important clinical or subclinical disease in broiler chickens. In this study sera samples from 46 poultry flocks in Sharekord area, Iran, were tested for the presence of chicken infectious anemia virus (CIAV) antibodies using a commercial enzyme-linked immunosorbent assay kit. All farms were positive for CIAV antibodies and 87.7% of chickens were positive. The prevalence of seropositivity was always over 20% (average 87.7%). Rates of antibody-positive chickens among flocks ranged from 20% to 100%. Seroprevalence was higher within the older flocks than in the younger flock. This is the first report of serologic evidence of CIAV in Shahrekord province, Iran. Since Shahrekord located in the center of Iran and one day chickens imported form other provinces, the infection can probably be found throughout the country and beyond. Further studies are necessary to assess economic losses due to CIAV and the cost benefit of countermeasures.
  T. Zahraei Salehi , M. Mahzounieh and A. Saeedzadeh
  The presence of Salmonella was detected in 192 samples of poultry carcasses from poultry farms in Shiraz province (Iran). A total of 30 Salmonella isolates were found in chicken samples (15.6%), by conventional culturing and confirmed by PCR and serology methods. Strains of serogroup D1 were the most prevalent strains, followed by serogroups C1, B and C2. All strains were subjected to Salmonella-specific gene (invA) and were confirmed as Salmonella positive by the predicted product a 284-bp DNA fragment.
  T. Zahraei Salehi and S. Farashi Bonab
  Antimicrobial agents are used extremely in order to reducing the enormous losses caused by Escherichia coli infections (colibacillosis) in Iran poultry industry. In this investigation fifty avian pathogenic Escherichia coli (APEC) strains isolated from broiler chickens with colisepticemia and examined for susceptibility to antimicrobials of veterinary and human significance. In vitro antibiotic activities of 32 antibiotic substances against the isolates were determined by disc diffusion test (Kirby Bauer method). Multiple resistances to antibiotics were observed in all the isolates. The highest rate of resistance was against Nalidixic acid (100%), Lincomycin (100%), Erythromycin (97%), Oxytetracycline (95%), Chlortetracycline (95%), Tetracycline (94%), Flumequine (94%), Tiamulin (91%), Doxycycline (88%), Difloxacin (83%), Neomycin (81%), Streptomycin (81%), Trimethoprim-Sulphamethoxazole (80%), Kanamycin (77%), Enrofloxacin (76%), Norfloxacin (68%), Ciprofloxacin (67%), Chloramphenicol (67%), Furazolidone (66%), Nitrofurantoin (56%), Amoxicillin (53%) and Ampicillin (47%). Resistance to Gentamicin wasn`t observed and to Amikacin, Cefazolin, Colistin, Tobramycin, Ceftizoxime, Cefixime, Lincospectin, Ceftazidime and also Florfenicol were low. This study showed resistance rate against the antibiotics that are commonly used in poultry is very high but against them that are only used in human or less frequently used in poultry is significantly low. These findings confirm significant increase in the incidence of antimicrobial resistance in the E. coli strains is most probably due to increased use of antibiotics as feed additives for growth promotion and prevention of diseases, use of inappropriate antibiotics for treatment of diseases, resistance transfer among different bacteria and possible cross resistance between antibiotics used in poultry. This study also showed that the prevalence of Quinolone-Resistant Escherichia coli (QREC) is very high in broiler farms in Tabriz province. The high presence of QREC from broiler chickens probably is due to overuse of enrofloxacin in these farms for therapeutic purposes. The present study suggests introduction of surveillance programs to monitor antimicrobial resistance in pathogenic bacteria is strongly needed because other than animal health problems, transmission of resistant clones and resistance plasmids of E. coli from food animals (especially poultry) to humans can occur.
  M. Mahzounieh , I. Karimi , T. Zahraei Salehi and R. Marjanian
  The present research studied the capacity of Saccharomyces boulardii (S. boulardii) to antagonize Salmonella typhimurium (S. typhimurium) in the intestinal tract and humoral response of rats after challenging with S. typhimurium. Sixty conventional male rats were divided at random into 4 groups. The S.boulardii suspensions contained 106, 07 and 108 cells mL-1 were administered (orally) to 3 groups (A, B and C) of rats, respectively for 5 continues days. The rats of group D received Saline instead of S.boulardii and used as control. All of rats challenged with 107 CFU of pathogenic S. typhimurium at fifth day. The viable Salmonella were counted at g-1 of faeces of rates at 0, , 3, 5 and 7 days after challenge. Titer of anti- salmonella antibodies were determined. Present experiments showed that S. boulardii could reduce the bacterial colonization in experimental animals. There was a significant reduction at number of S. typhimurium between control and test groups. A daily dose of 106 yeast cells was resulted in the most reduction in bacterial shedding and high titers of anti salmonella antibodies. The mortality rates were 0 and 46.4% in yeast treatment and control animals, respectively. S. typhimurium viable cells were not detected in the organs of yeast-treated rats. We conclude that S. boulardii has a preventive effect in pathogenesis of S. typhimurium.
 
 
 
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