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Abstract

Bachground and objectives:

micro-organisms, usually made from strains of the genera

Probiotics are nonpathogenic and beneficialLactobacillus and

Bifidobacterium. The probiotics are known as dietary supplements withLactobacillus and

Bifidobacterium , in sufficient quantities and specific compound, are used for

Material and Methods:

obtained from dairy products, yogurt, grains cheese, saffron flower, fresh

pinto beans, red beans, fresh green beans . All samples were incubated in

MRS Agar cultures at 42, 37, and 25

isolated, concentrated, and lyophilized. Finally the differential recognition

was performed in deferential cultures.

In this cross-sectional study 100 Samples were°c for two days, and then bacteria were

Results

isolated. Lactobacillus delbrueki and L.bulgaris(each 10 cases)

(8 cases) and L .casei (5 cases) are the most prevalent Lactobacillus strains.

Lactococcus themrophilus the most frequent Lactococcus where isolated in

this study.

: Of 100 food samples 19 Lactobacillus and Lactococcus strains were، L.salivarius

Conclusion:

especially Lactobacillus strains are presented in foods. It is recommended that

these probiotics be isolated and proliferated and used in industry and also for

therapeutic purposes.

Based on the results of this study, many kinds of probiotics

Key words:

probiotic, Lactobacillus, foods

therapeutic purposes and food industry. The aim of this study was to evaluate

the frequency of Lactobacillus and Lactococcus strains in food stuffs cities in

Eastern Azerbaijan, Iran.

beneficial effects on consumer health. In some countries,

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Abstract Background and objectives: Group A Streptococcus (GAS) strains have been identified by serologic methods based on surface protein antigens, T and M. Accordingly, different serotypes have been reported worldwide. Recently, the previous out of date procedures have been replaced by N-terminal emm gene sequence, which has been used in identifying more than 150 emm types. We aimed to determine the prevalence of emm types and phenotypes resistance to erythromycin among streptococci isolated from the throat in north of Iran. Material and Methods: 50 GAS isolates from sore throat of patients referred to a few local hospitals in Tonekabon, Ramsar, and Chalus in northwest of Iran (2010-2011), by using blood agar, bacitracin sensitivity test, PYR test and agglutination by specific antiserum. Antibiotic resistance of the isolates was determined by the discs branded by Iranian Padtan Teb Company, using Kirby Bauer Test, and analyzed by CLSI standards. The mechanism of resistance to erythromycin was evaluated by Double Disk Diffusion Test in the presence of erythromycin and clindamycin. emm gene of all isolates were reproduced and their PCR products sequenced by the Korean Macrogen company. To determine the emm types, using BLAST2.0 program (National Center for Biotechnology Information, available in WWW.ncbi.nlm.nih.gov / BLAST), and the emm gene sequences were compared with sequences in the gene bank. Results: we identified Four different types of emm, including e mm5 (26 52 %), emm12 (12 24%), emm79 (6 % 12) and emm86 (6 % 12). All beta lactam antibiotics have inhibitory effect on isolates, while18% of isolates (9 of 50) are resistant to erythromycin. The most common resistance phenotype is cMLSB (% 66.6) and the next one is phenotype M (% 33.3), but phenotype iMLSB is not observed in none of the isolates. Twelve percent (6cases) of isolates are resistant to clindamycin. Conclusion: The results of present study show different types of GAS than those reported worldwide. The emergences of emm86 in pharyngitis and erythromycin resistance are the two valuable findings of this research. Keywords:Streotococcus pyogenes,erythromycin,cMLSB,iMLSB

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