جستجوی مقالات مرتبط با کلیدواژه « عفونت های تنفسی » در نشریات گروه « زیست شناسی »

Enteroviruses (E.V.s) and human parechovirus (HPeV) play an important role in childhood diseases, from mild infections to severe illnesses which cause morbidity and mortality. Since the diagnostic procedures are not routinely accessible in the clinical laboratory, the epidemiology of enterovirus and parechovirus remains ambiguous. The current study investigates the frequency of human Enteroviruses and Parechovirus in hospitalized children.

Nasopharyngeal swabs were collected from children younger than five years with severe acute respiratory symptoms admitted to the hospital and screened for E.V.s and HPeV using RT-PCR and a two-step real-time PCR.

From 80 nasopharyngeal swabs, viral agents were detected in 4 (5%) hospitalized children with ARTIs. All of these positive cases were infants. The results of RT-PCR of pan-HPeV demonstrate no detection of HPeV. Four samples were positive for enterovirus (5%). The frequency of E.V.s and HPeV between different sexes was not significant. Also, the distribution of E.V.s and HPeV among the other age groups was not significant (P>0.05).

Enteroviruses and human Parechoviruses can cause severe consequences like neurological impairments, and more importantly, the epidemiological characteristics information in this regard is limited. Therefore, further research on viral respiratory tract infections is needed to improve public health and prevent severe complications.

COVID-19, the disease caused by SARS-CoV-2, is a highly contagious disease. The World Health Organization has declared the ongoing outbreak to be a global public health emergency. Currently, the research on SARS-CoV-2 is in its primary stages. Based on current published evidence, this review systematically summarizes the epidemiology, clinical characteristics, diagnosis, treatment and prevention of COVID-19. It is hoped that this review will help the public to recognize and deal with SARS-CoV-2, and provide a reference for future studies.

Background & Respiratory system infections is a common infectious disease and is an acute inflammation of the upper respiratory system caused by several bacterial infections including Staphylococcus aureus. The aim of this study was to investigate the coagulase gene polymorphism of S. aureus isolated from clinical respiratory system infections samples in Shahrekord of Iran.
Material & This study was conducted by a sectional-descriptive study on 200 persons suspected to the upper respiratory system infections who referred to Imam Ali clinic in Shahrekord. After growth of microorganisms on blood agar and manitol salt agar, the suspected colonies were identified by microbiological testing. Next, DNA samples were prepared and the products of PCR reactions were enzymatically digested and genes were genotyped using RFLP.
Overall, 60 patients (30%) were infected to S. aureus. Among them 42 isolates showed a 970 bp fragments and 18 isolates showed a 730bp fragments. After enzymatic digestion with AluI, 42 specimens contained three bands: 320, 490, and 160 bp (genotype I), while 16 specimens contained two bands: 490 and 240 bp (genotype VIII) and 2 specimens contained two bands: 410 and 320 bp (genotype IX).
The results obtained from present study showed that coagulase-positive S. aureus strains isolated from respiratory system infections in Shahrekord belonged mostly to genotype type I, which can be considered as a potential source for the release of the genotypes in the population.

Staphylococcus aureus is considered as one of pathogenic agents in humans, that engages different body parts including respiratory system and causes to spend lots of costs and extending patient’s treatment period. This study which is performed to separate and investigate the pattern of antibiotic resistance in Staphylococcus aureus isolates from upper respiratory system infections in Shahrekord. This study was done by sectional-descriptive method On 200 suspicious persons to the upper respiratory system infections who were referred to the Imam Ali clinic in Shahrekord in 2012. After isolation of Staphylococcus aureus from cultured nose discharges, antibiotic resistance genes were identified by polymerase chain reaction (PCR) by using defined primer pairs. Among 200 investigated samples in 60 cases (30%) Staphylococcus aureus infection (by culturing and PCR method) was determined. Isolates showed the lowest amount of antibiotic resistance to vancomycin (0.5%) and the highest amount of resistance to the penicillin G and cefotaxime (100%). mecA gene (encoding methicillin resistance) with frequency of 85.18% and aacA-D gene (encoding resistance to aminoglycosides) with frequency of 28.33% showed the highest and lowest frequency of antibiotic resistance genes coding in Staphylococcus aureus isolates respectively. Discussion and Notable prevalence of resistant Staphylococcus aureus isolates in community acquired respiratory infections, recommend continuous control necessity to impede the spreading of these bacteria and their infections.