Showing 8 results for Polymerase Chain Reaction
F Shrafati-Chaleshtori, R Sharafati-Chaleshtori, A Shakerian, H Momtaz,
Volume 3, Issue 1 (4-2009)
Abstract
Abstract Background and objectives: Paratuberculosis or John's disease is a chronic infectious disease of ruminants caused by Mycobacterium avium subsp. paratuberculosis (MAP). It results in major economic losses to dairy farm of all over the world and it is the agent causing crohn's disease. The aim of this study was to detect the MAP using PCR in raw-milk samples of cows in shahre-kord. Material and Methods: In this cross–sectional study, 100 raw milk samples of cows were collected from both industrial and semi -industrial farms in shahre-kord. The DNA of all Samples was isolated by MAP, using PCR method. Results: The results Show that only three (3%) Samples were positive for Mycobacterium avium subsp. paratuberculosis. Conclusion: Based on our results, Milk -PCR was useful for detection of MAP in milk samples. Key words: Mycobacterium paratuberculosis, milk, polymerase chain reaction.
Shakerian, A, Sharafati-Chaleshtori, R, Karshenas, Aa, Rahimi, E,
Volume 9, Issue 3 (9-2015)
Abstract
Background and Objective: Cryptosporidium parvum is a zoonotic protozoan parasite causing diarrheal cryptosporidiosis. Numerous outbreaks of cryptosporidiosis have been reported worldwide. The transmission via milk, water and raw animal products is one of the important ways. The aim of this study was the identification of hsp70 gene in Cryptosporidium parvum in raw cow’s milk samples.
Material and Methods: In this cross sectional study, 38 raw cow’s milk samples of bulk tank were randomly collected from traditional and semi industrial cattle farms in Isfahan. To identify the protozoa in milk samples, the extracted DNA was evaluated by Nested polymerase chain reaction (PCR).
Results: Based on Nested polymerase chain reaction, 2 samples (5.26%) were infected to Cryptosporidium parvum.
Conclusions: The contamination of milk with Cryptosporidium Parvum is less than that of the other foodstuffs. Thus, it is necessary to reduce food contamination and to have appropriate health education programs.
Keywords: Cryptosporidium Parvum, Milk; Polymerase Chain Reaction.
Adel Ebrahimzadeh, Tahereh Davoodi , Abbas Pashaei Naghadeh ,
Volume 9, Issue 4 (10-2015)
Abstract
Abstract
Background and Objectives: Plasmodium falciparum merozoite surface protein-1 (PfMSP-1) is a promising vaccine against malaria during its blood stages which play an important role in immunity to this disease. Polymorphic nature of this gene is a major obstacle in making an effective vaccine against malaria. In this study, the genetic diversity of Plasmodium falciparum isolates was investigated in Sistan-Baluchestan Province using allelic families of the MSP-1.
Methods: From March/April 2011 to August/September 2012, 94 blood samples were collected from patients with falciparum malaria who were living in four districts of Sistan-Baluchestan Province. The extracted genomic DNA and genetic diversity of MSP-1 block 2 were evaluated by nested polymerase chain reaction.
Results: From a total of 94 patients, 89 patients (94.7%) had positive PCR results and the remaining five patients were excluded. Seven different alleles of MSP-1 were identified through size difference on agarose gel. Comprising 46.1% of the samples, MAD20 was identified as the predominant MSP-1 allelic family, while the RO33 family had the lowest frequency (with 7.9%). In 10% of samples infection with two alleles was observed.
Conclusion: The results of this study suggest that genetic diversity of PfMSP-1 in Southeastern Iran is relatively low and most infections originate from a clone that is consistent with an area of low malaria transmission. This information is useful for the prevention and control of malaria in Iran.
Keywords: Merozoite Surface Protein 1, Plasmodium Falciparum, Polymerase Chain Reaction
Farid Soltani , Saman Mahdavi ,
Volume 12, Issue 6 (11-2018)
Abstract
ABSTRACT
Background and objectives: Bacillus licheniformis is a potential cause of spoilage in pasteurized products. The aim of this study was to identify and isolate B. licheniformis from commercial pasteurized fruit juices distributed in the West Azarbaijan Province, Iran.
Methods: Sixteen fruit juice samples including four apple juice and 12 orange juice samples were collected from five fruit juice manufacturing companies in Iran. The samples were tested for the presence of B. licheniformis by culture in specific media and biochemical testing. Suspected samples were also investigated for the presence of the bacterium by polymerase chain reaction using specific primer for the gyrB gene.
Results: Three samples (18.75%) from the 16 tested fruit juice samples were found as positive. In other words, one apple juice sample (25%) and two orange juice samples (16.66%) were contaminated with B. licheniformis.
Conclusion: Isolation of this bacterium indicates the unsuitable manufacturing conditions and ineffective bacterial decontamination, which might also be favorable for the growth of other fruit juice spoilage bacteria.
KEYWORDS: Bacillus licheniformis, Fruit and Vegetable Juices, Polymerase Chain Reaction.
Shadi Beladi Ghannadi , Maryam Ghane , Laleh Babaeekhou ,
Volume 13, Issue 2 (3-2019)
Abstract
ABSTRACT
Background and Objectives: The emergence of extended-spectrum β-lactamase (ESBL)-producing Shigella spp. is becoming a health concern worldwide. This study aimed to investigate antibiotic resistance pattern and frequency of blaCTX-M, blaSHV, and blaTEM genes among Shigella isolates from patients in hospitals of Tehran, Iran.
Methods: In this cross-sectional study, 52 non-repeated Shigella strains were isolated from hospitalized patients in Milad, Emam Khomeini and Shariati hospitals in Tehran (Iran) from November 2015 to December 2016. Bacterial identification, serotyping, and antimicrobial susceptibility testing were performed according to the standard guidelines. The blaCTX-M, blaSHV, and blaTEM resistance genes were identified using multiplex polymerase chain reaction.
Results: Among 52 Shigella isolates, S. sonnei (44.2%) was the predominant species, followed by S. flexneri and S. dysenteriae (23%). Over 67% of the isolates were multidrug resistant. The highest rates of resistance were observed against cefalotin (67.3%), tetracycline (67.3%), amikacin (63.5%), trimethoprim-sulphamethoxazole (48.1), and ampicillin (42.3%). The lowest resistance rate was against ciprofloxacin (1.9%). We detected the blaTEM and blaCTX-M genes in 61.5% and 19.2% of the isolates, respectively. However, the blaSHV gene was not detected in any of the isolates. In addition, 16.4% of the isolates harbored the blaTEM and blaCTX-M genes simultaneously. Ciprofloxacin was the most effective antibiotics according to the ESBL genes distribution.
Conclusion: Our findings indicate the high prevalence of multidrug resistance and ESBL genes in Shigella isolates, which elucidates the need for appropriate infection control measures for limiting the spread of resistant strains.
Keywords: Shigella, Multiplex Polymerase Chain Reaction, Drug Resistance.
Mishar Kelishadi , Mandana Kelishadi , G.hossein Ashrafi , Alijan Tabarraei ,
Volume 13, Issue 4 (7-2019)
Abstract
ABSTRACT
Background and Objectives: Pterygium is a common ocular surface lesion that manifest as wing-shaped, benign
conjunctival growth, which can extend onto the corneal surface. Presence of some oncogenic viruses in pterygium and the neoplastic nature of the lesion led us to the postulated involvement of the viruses in the etiology of pterygia. The aim of this study was to evaluate prevalence and possible role of human cytomegalovirus (HCMV) in the formation of pterygia.
Methods: Fifty pterygium specimens and 10 normal conjunctival biopsy specimens (controls) were investigated by polymerase chain reaction using primers specific for the highly conserved regions of major capsid protein gene of HCMV. Data were analyzed using SPSS statistical software (IBM SPSS Statistics 18; IBM Corporation, USA) at significance level of 0.05.
Results: The HCMV DNA was detected in seven (14%) patients with pterygium but in none of the control subjects. All subjects were β-globin positive.
Conclusion: Given the results, direct involvement of HCMV in the development of pterygium seems less probable, thus suggesting that other agents might be involved in the multistep process of the disease.
Keywords: Human Cytomegalovirus, Pterygium, Polymerase Chain Reaction.
Maryam Moazeni, Mojtaba Nabili,
Volume 16, Issue 2 (3-2022)
Abstract
Background and objectives: The incidence of candiduria caused by Candida spp. has increased in recent years, particularly in hospitalized patients. Candiduria is most commonly caused by Candida albicans; however, an increase in the prevalence of non-albicans species has been observed during last decades. This study aimed at molecular identification of Candida species isolated from candiduria in hospitalized patients.
Methods: This cross-sectional study was conducted on 530 hospitalized patients in two hospitals in the Mazandaran Province, Iran. Midstream urine specimens were collected and then cultured on CHROMagar Candida medium. Molecular identification of common Candida species was carried out using the polymerase chain reaction-restriction fragment length polymorphism method after enzymatic digestion with MspI. C. albicans and Candida parapsilosis species complexes were identified by amplification of the HWP1 and intein-containing vacuolar ATPase precursor genes, respectively.
Results: The frequency of candiduria was estimated at 14% among hospitalized patients. Of 74 samples positive for candiduria, 65 (87.8%) were isolated from females. The most common predisposing factor to candiduria was diabetes (n=36; 48.6%). The most frequent isolates were C. albicans complex (n=44; 59.4%), followed by Candida glabrata (n= 16; 21.6%), Candida tropicalis (n= 10; 13.5%), Candida Krusei (n= 3; 4%) and C. parapsilosis (n= 1; 1.3%).
Conclusion: Based on the results, the conventional and molecular methods produced similar results for identification of Candida species. However, accurate identification of Candida spp. requires the use of molecular techniques such as PCR-RFLP, HWP1, and intein-containing vacuolar ATPase precursor genes. Nevertheless, chromogenic methods such as CHROMagar Candida can be used for diagnosis of Candida spp. in laboratories with limited resources.
Ali Vaez, Hadi Razavi Niko, Seyyede Delafruz Hosseini, Elham Mobasheri, Alijan Tabarraei,
Volume 17, Issue 5 (9-2023)
Abstract
Background: The hepatitis B virus (HBV) is a major public health problem worldwide. Vertical and horizontal transmission of HBV could affect neonates and partners. This transmission can vary in populations. Also, high-risk behaviors and clinical records affect the transmission of this virus. Due to the lack of information on vaginal discharge related to HBV in the north of Iran, we aimed to assess the presence of HBV in pregnant women's vaginal secretion referred to Sayyad Shirazi Hospital in Gorgan City, north of Iran.
Methods: This cross-sectional study was performed on 315 cervicovaginal lavages from pregnant women. Viral DNA was extracted, and the gene fragments of the virus were checked by polymerase chain reaction (PCR). Clinical, demographic, and behavioral data were entered into SPSS version 16. The chi-square tests were used to determine any association between categorical data.
Results: Hepatitis B virus DNA was detected in 2.2% (7/315) of samples. The age range of patients was from 14 to 43 years. Anal sex (P = 0.043) and not using a condom (P = 0.047) were significantly associated with HBV-positive cases. Abortion, unusual discharge, and some other clinical and demographic information showed no related statistical correlation.
Conclusion: The results showed a similar rate of infection in the general Iranian population. In pregnant women, the risk of HBV transmission and chronic HBV can be critical in newborns; therefore, it is strongly recommended to conduct screening and provide management for women during pregnancy.
