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Background: With due attention to the prevalence of thalassemia in Iran and patients' importunate needs for blood intake, this study aimed to inspect contaminations due to repeated blood transfusion which does not sift in blood donation. One such contamination is cytomegalovirus infection, which is an important pathogen in immunosuppressive patients or receivers of transplanted organs.

Methods: This cross sectional study was conducted on 311 thalassemia patients under age of 15 yr who was receiving blood from Hospitals in Tehran and Noorabad Mamasani repeatedly. To determine active infection (presence of IgM antibodies) of cytomegalovirus, ELISA method was used. In addi­tion, 225 healthy people under age of 15 yr were studied as testified group and finally all data were analyzed using SPSS ver. 11.5.

Results: 12.9 % of patients were positive from the view point of active infection. Regional separation of patients showed that the patients resided in Tehran are more contaminated to this virus than patients of other cities.

Conclusion: The range of cytomegalovirus active infection in thalassemia patients is high. One reason might be the infected blood intake or immunosuppressant (weakness of immune system) in patients, there­fore immunity care of these patients and negative serologic blood intake with respect to and also he­matic parents (parents with the same blood) are important.

Background: Septicemia is a life threatening status and needs rapid antibiotic treatment. Enterobacteri­acea are one of the most important causes of septicemia. So this study is therefore aimed to evaluate antibiotic sus­ceptibility of enterobacteriacea isolates in blood cultures in Shariati Hospital, Tehran, Iran.

Methods: This retrospective study was performed on 138 patients with positive blood culture in Shariati Hospital, Tehran, Iran in 2004, using disk diffusion and Macfarland standard. 

Results: Prevalence of isolated enterobacteriacea was respectively E. coli (n=74, 53.6%), Klebsiella (n=37, 26.8%), Enterobacter (n=21, 15.2%), Citrobacter (n=4, 2.9%), Salmonella paratyphi (n=1, 0.7%) and Proteus mirabilis (n=1, 0.7%). The most antibiotic susceptibility among enterobacteriaceaes was ciprofloxacin (60.4%), cloramphenicol (56.8 %) and gentamycin (49.3%). The most antibiotic re­sistance were seen among cephalotine (78%), cotrimoxazole (62.3 %) and ceftriaxon (57.5 %).

Conclusions: Due to dissimilarity between antibiotic consumption in laboratories and hospitals, it seems that to reach more proper conclusions and choosing better strategy for antibiotic consumption, cooperation should be between laboratories and physicians, plus synergism between drug prescription and antibiotic discs in laboratories.

Background and Aim: Enteroinvasive Escherichia coli (EIEC) strains include a group of diarrheagenic Escherichia coli (DEC) and are known to cause shigellosis-like symptoms in both adults and children. They belong to a limited number of serotypes and their somatic (O) antigens are identical with, or related to, certain Shigella antigens. EIEC strains are confirmed by demonstration of invasiveness by polymerase chain reaction (PCR) for detection of the ipaH (invasive plasmid antigen H)  gene that is specific for these strains among DEC.Since in our country,Iran study for detection of  these strains. hasnot been carried out therefore the aim of this study was detection of EIEC in diarrheal under 5 year old children in Tehran.

Materials and Methods: During the descriptive study,300stool samples were collected from children with diarrhea in Ali Asghar Hospital and children medicinal center of Tehran during 4 months (April-Jul 2008). E.coli species were isolated by standard bacteriological and biochemical tests. Presence of invasive plasmid antigen H (ipaH) gene in confirmed colonies was investigated by PCR technique.

Results: Among 300 stool specimens studied using culture method and biochemical tests,39(13%) E.coli species were isolated. Among these 39 strains,7(2.3%) strains containing ipaH gene (EIEC) were detected by PCR technique.

Conclusions: Enteroinvasive Escherichia coli (EIEC) in our country, Iran, may be as bacterial pathogen causing childhood diarrhea. Therefore we should apply new techniques for investigation of these strains.

Background and Aim: Group B streptococcus(GBS)(Streptococcus agalactiae) is the leading cause of morbidity and mortality of the newborn infant and accounted as a factor leading septicemia after birth in mothers. Infections in infants are usually acquired by contact with the genital tract of the mother during labor and delivery. So a rapid screening test for group B streptococcus that could accurately identify pregnant women who are carrying the bacteria at the time of delivery would obviate the need for prenatal screening.The goal of this study was molecular epidemiology of group B beta Hemolytic Streptococcal(GBS) colonization in the vaginal flora of pregnant women.

Materials and Methods: Samples were taken from mucus of anal and vaginal of 250 pregnant women during 35-37 week's ingestion by swap. Samples were tested by standard culture using Todd Hewitt Broth and Blood Agar and also by PCR using cfb gene.

Results: Culture identified 21(8.4%) women as carriage of GBS from 250 women but PCR assay could identify 24(9/6%) women. In comparison to culture results, sensitivity, NPV Specificity PPV of PCR Were(100%, 100% and 97%, 82%) respectively. The times that used for PCR assay and culture were 2h and 36h respectively.

Conclusion: In conclusion, we found that group B streptococci can be detected rapidly and reliably by a PCR assay of combined vaginal and anal secretions from pregnant women at the time of delivery. Also this study shows that incidence of GBS is at high rate in Iranian pregnant woman, so we recommend screening of pregnant woman for detecting of GBS emphatically.

Background and Aim: Although vancomycine is used for the treatment of methicillin resistant Staphylococci, but vancomycine alone might not be effective for the treatment of methicillin resistant Staphylococci in compromised host. In the same time antimicrobial activity of cefepim on gram positive bacteria especially Staphylococci is well known. In this study the synergism effect of cefepim and vavcomycin on positive and negative coagulase Staphylococci in vitro condition was investigated.

Materials and Methods: In total, 100 clinical samples of coagulase positive and negative Staphylococci were isolated from urine and blood samples from patients in Imam Khomeini Hospital during one year and identified .The modified Bauer-Kirby were used for the antibiotic susceptibility and macrodilution method for the MIC according to NCCLS procedure.

Results: The results showed that after adding vancomycin to cefepime in concentration from 0.05+ 0.5 , to 0.8+8 , growth reduction reached from 3.5% to 100%.The synergism effect of the two mentioned antibiotics on coagulase negative Staphylococci resistant to methicillin were shown that from concentration of 0.05+ 0.5 to 0.8+8 , a reduction in growth from 4.5% to 100% was observed.

Conclusion: The results of this study showed that vancomycin and cefepime has synergic effect on Staphylococci

Background and Aim: Dental caries in children caused by repeatable consumption of sweet product especially at night, that itself mostly depend on economic and cultural background of the society and family.
One of the most common diseases of human being is dental caries, which are caused by many factors, such as microorganisms, dieting, passing time, and the host itself. Among the microorganisms Streptococci mutants play the major role in causing dental caries. The aim of this research was to investigate the role of Streptococci mutants in dental caries between two groups of children sensitive and resistance to caries.

Materials and Methods: This was a cross-sectional research, in which 120 children(60 susceptible and 60 resistance) aged between 3 to 5 referred to Tehran University dental school were selected randomly. The selection criteria for the sensitive and resistance dental caries were dmfs > 5 and dmfs < 10 respectively. None of the groups had used any drug or fluoride products before sampling. Saliva of both groups were collected, and transferred to the specific culture media(Mitis Salivarious Agar). After incubation at 37 oC colonies of S.mutans were counted.

Results: There was a significant difference between the number of colony counting(cfu/ml) with age and consumption of repeated sugar product, while. there was no significant difference between(cfu/ml) sex, oral hygiene, and nutrition period during infancy.

Conclusion: The results of this study showed that the consumption of sugar product in childhood results in dental carries.

 Background and Aim: Cream is a rich dairy product with the pH close to neutral and limited preservation capability. Cream is suitable and rich for microbial growth. In the past few decades, there was a great concern in contamination of food products.

 Salmonella and Yersinia species are two important pathogens causing food poisoning and human gastroenteritis. The aim of the present study is to investigate the quality of traditional cream for bacterial contamination.

 Materials and Methods: This is a cross-sectional study. In total, 100 unpasteurized cream samples were collected from 5 regions in Tehran. The Salmonella was enriched in Selenite-F broth, and Yersinia in phosphate buffer in two weeks in cold condition according to CDC, and then were inoculated in MacConky and CIN agar for 24 hours. The suspected colonies were examined for phenotype and their identification was confirmed by API-20 E.

 Results:  In general, 29% of tested cream samples were contaminated with at least one kind of bacteria, 3% with Yersinia (1strain Y.enterocolitica, 1 Y.intermedia, 1 frederiksenii), and 2% with Salmonella paratyphi B. The other bacteria like Escheichia coli, Enteobacter, klebsiella, and Citobacter were also isolated. Five samples were contaminated with two kinds of bacteria.

 Conclusion: The results of this study indicate that more quality control should be applied on the cream produced in the city of Tehran by health control office for food products. 

 Background and Aim: Along with the constant increase in world population and consequently, the growing need to provide cellulose, as the most abundant organic substance in nature to produce cellulose products, concerns regarding the possible contamination of these products might cause skin, and genital and urinary infections. The aim of this study is to determine the possible microbial contamination of these products supplied in the city of Tehran.

 Materials and Methods: This is a descriptive study on 200 samples of unexpired cellulose products including napkins, nappies, sanitary napkin, and cardboard boxes to carry sweets. Fifty samples were obtained in the city of Tehran during six months from September 2011 to February 2012. Microbial contamination was investigated according to the procedure proposed by the Institute of Standards and Industrial Research of Iran.

 Results: The results obtained indicate that 18 samples (9%) exceeded the level allowed for aerobic bacteria and molds in one gram of specimens. Besides, 16 samples (8%) were contaminated with at least one of the following bacteria: Streptococcus Group D, Staphylococcus aureus, Pseudomonas aeruginosa and Escherichia coli. A total of 34 samples (17%) could not be consumed. The least and the most contaminated products were sanitary napkins (0.5%) and cardboard boxes to carry sweets (5%), respectively.

 Conclusion: The presence of pathogenic bacteria in cellulose products that could cause skin, and genital and urinary tract infections asks for more control over such sanitary products.